Limitations and institutional relationships | Edexcel A-Level Politics
Updated: 4 days ago
For Specification 9PL0
Edexcel A-Level Politics | Free Revision Notes
Estimated study time:Â 50 minutes
US Presidents possess considerable formal and informal powers, but their ability to use them is constrained by other institutions and by changing political circumstances. This Limitations and institutional relationships A-Level Politics revision page examines presidential relationships with Congress and the Supreme Court, alongside the Constitution, election cycle and divided government. It builds on constitutional presidential authority and non-constitutional sources of influence, helping explain why presidential power can change substantially both between presidents and during a single presidency.
Learning Objectives 🎯
By the end of this revision page, you should be able to:
Explain how the US Constitution limits presidential power.
Examine the relationship between the President and Congress.
Examine the relationship between the President and the Supreme Court.
Explain how the election cycle and divided government can constrain presidential power.
Analyse why presidential power changes during a President's term of office.
Evaluate the significance of presidential limitations with reference to presidents since 1992.
These objectives follow section 3.3 of the Edexcel specification and the lesson sequence in the revision plan.
Revision Notes đź“š
Why presidential power is limited
The President is one of three branches of the federal government. The other two are:
the legislative branch, headed by Congress
the judiciary, headed by the Supreme Court
The Constitution divides power between these branches rather than concentrating it entirely in the presidency. Edexcel requires students to understand both presidential relationships with Congress and the Supreme Court and why those relationships vary.
The central idea is therefore:
presidential powers may remain constitutionally similar, but the President's practical ability to use them changes according to political circumstances.
This distinction is vital in examinations. Do not simply ask, "What powers does the President have?" Ask:
How effectively can this President use those powers in these circumstances?
The Constitution as a limitation on presidential power
The US Constitution creates separation of powers and checks and balances.
The President leads the executive branch but does not control the legislative or judicial branches. This immediately places limits on presidential action.
The Constitution can therefore create a situation in which the President has an objective but must gain the cooperation of another institution to achieve it.
This links directly to your earlier study of constitutional checks and balances.
Separation of powers
Under separation of powers, executive, legislative and judicial authority are placed in separate institutions.
For the President, this means:
the President does not control Congress simply by winning a presidential election
members of Congress are separately elected
the President cannot directly command Congress to introduce and pass legislation
Supreme Court justices operate independently once appointed
Edexcel's 2025 mark scheme emphasises that Presidents must rely on members of Congress to introduce legislation because they have no direct power over Congress.
This makes the President dependent on political negotiation and helps explain the importance of the powers of persuasion.
Checks and balances
The Constitution gives each branch mechanisms through which it can restrict the others.
Important checks on presidential power include:
Presidential action or power | Constitutional limitation |
Pursuing a legislative programme | Legislation must pass through Congress |
Vetoing congressional legislation | Congress can override a veto with a two-thirds majority in both chambers |
Funding presidential programmes | Congress controls federal funding |
Negotiating formal treaties | Treaties require a two-thirds majority in the Senate |
Making significant appointments | Presidential nominees are subject to Senate approval |
Using executive powers | The Supreme Court can use judicial review to determine constitutionality |
These checks do not make the President powerless. They create interdependence between institutions.
Edexcel's 2023 mark scheme stresses that checks and balances require the branches to work together and that the Supreme Court can review legislation, programmes and executive orders to determine whether they are constitutional.
An imperilled presidency?
The Edexcel specification includes the term imperilled presidency.
This is the contrasting theory to the imperial presidency. An imperilled presidency is the argument that the President does not have enough power to be effective.
This concept is useful when thinking about constitutional limitations.
A President may appear extremely powerful because they are Head of State, Head of Government and Commander-in-Chief. However, if Congress blocks legislation and funding while the Supreme Court restricts executive action, the President can become considerably less effective.
The question is therefore not simply whether limitations exist, but how significant they are in practice.
The President and Congress
Congress is one of the most important potential limitations on presidential power.
The relationship is complex because the President and Congress need each other in some areas while checking one another in others.
Understanding congressional powers from congressional oversight is particularly useful here.
Dependence on Congress for legislation
The President may set out policy priorities and attempt to shape the national agenda, but the President cannot personally introduce and pass legislation.
Edexcel mark schemes stress that legislative proposals have to move through Congress, leaving Presidents dependent upon congressional support.
This creates a fundamental limitation:
presidential objective → need for congressional action → bargaining and persuasion → uncertain outcome
The President may therefore possess a strong electoral mandate without being able to guarantee implementation of the promised programme.
Example: Obama and Trump on healthcare
An Edexcel mark scheme uses both Barack Obama and Donald Trump's healthcare reforms to demonstrate Presidents having to work with Congress over major policy priorities.
The analytical value of this example is more important than memorising a narrative.
Both show that:
Presidents may make an issue central to their political programme
presidential commitment alone cannot enact legislation
congressional support remains necessary
the constitutional system forces Presidents to negotiate with legislators
This is a clear example of the Constitution limiting the practical power of the presidency.
Congress and the power of the purse
Congress also possesses major financial power.
A President may propose programmes or exercise executive authority, but presidential initiatives may depend upon Congress providing the necessary funding.
Edexcel's 2025 mark scheme emphasises that Presidents must seek congressional approval for funding for executive programmes and cannot simply overrule Congress to obtain that funding.
This is commonly called the power of the purse.
Why is this important?
A President may possess legal authority to pursue an objective but still struggle to implement it without funding.
This creates another analytical chain:
presidential objective → financial requirement → congressional funding decision → presidential power constrained
The 2022 examiner report specifically praised high-scoring candidates who linked presidential dominance in areas such as foreign policy to congressional limitations such as the power of the purse.
Vetoes do not remove congressional power
The presidential veto is an important formal power, but it is itself checked.
Congress may override a presidential veto with a two-thirds majority in both chambers.
This demonstrates the reciprocal nature of checks and balances.
Congress passes legislation.
The President can veto it.
Congress may override that veto if sufficient support exists.
Neither institution therefore has completely unrestricted legislative power.
Treaties and foreign affairs
The President can exercise considerable influence over foreign affairs, but this area also demonstrates congressional limitations.
Presidents may negotiate agreements, but formal treaties require ratification by a two-thirds majority in the Senate.
This means that even where the President takes the leading diplomatic role, Congress retains an important constitutional check.
The wider significance of this relationship becomes especially important in debates over presidential foreign-policy power.
Congressional oversight
Congress can also scrutinise the executive through its oversight role.
Edexcel defines oversight as the ability of one branch of government to supervise the work of another.
The strength of congressional oversight is not constant.
The 2025 mark scheme specifically notes that oversight may be stronger during divided government, when Presidents find it harder to rely on members of their own party for support and may need greater persuasion to secure legislation or funding.
This illustrates an important distinction:
constitutional powers of Congress remain available, but political circumstances affect how strongly Congress is willing or able to use them.
Congress does not always restrain the President effectively
Congress should not automatically be treated as a powerful and united obstacle to the President.
Under unified government, the President's party controls both chambers of Congress as well as the presidency.
Edexcel defines unified government as a situation in which both Houses of Congress and the presidency are controlled by people from the same party.
In these circumstances:
congressional leaders may be more willing to advance presidential proposals
the President may find it easier to build legislative support
scrutiny by Congress may be less confrontational
The 2025 mark scheme notes that under unified government Congress may be more willing to introduce and pass presidential proposals with less opposition.
However, unified government does not guarantee presidential control.
Members of Congress:
are independently elected
respond to their own constituents
may have different political priorities
are not formally subordinate to the President
This means that even members of the President's own party may oppose presidential proposals.
The President and the Supreme Court
The President's relationship with the Supreme Court is different from the relationship with Congress.
The President influences the Court partly through the appointment process, but the Court can also place significant constitutional limits on presidential action.
This connects to judicial independence and review.
Presidential appointments to the Supreme Court
Presidents nominate Supreme Court justices.
Appointments can be a major source of presidential influence because Supreme Court justices hold office beyond the term of the President who appointed them.
Edexcel's 2022 mark scheme notes that presidential appointments can influence the ideological direction of the Court long after a President has left office.
However, appointment power has two major limitations.
First, presidential nominations involve the Senate confirmation process.
Second, once appointed, justices are independent of presidential control.
The President cannot instruct a justice how to decide a case simply because that President nominated them.
The Senate can restrict presidential influence over the Court
The relationship between the presidency and Supreme Court cannot be understood without Congress.
A President nominates a justice, but the Senate plays its own constitutional role in determining whether the appointment proceeds.
One Edexcel mark scheme uses the example of Garland, whose confirmation hearings were prevented when Obama faced Senate opposition.
This shows how three parts of this lesson connect:
presidential appointment power → congressional check → election-cycle politics → changing presidential influence over the Court
Presidential influence over the judiciary therefore depends not simply on the constitutional power to nominate, but also on the political composition and behaviour of the Senate.
This prepares you for more detailed study of judicial appointments.
Independence of Supreme Court justices
Once appointed, Supreme Court justices are independent of presidential influence.
Edexcel mark schemes emphasise that Presidents cannot control the decisions justices make after their appointment.
This limits presidential power in an important way.
A President may nominate someone partly because of their expected ideological outlook, but:
the justice does not become a member of the presidential administration
the President cannot remove a justice simply for making an unwelcome decision
the President cannot overrule a Supreme Court judgement
The appointment power may therefore create long-term influence, but not direct presidential control.
Judicial review as a limitation
Through judicial review, the Supreme Court can judge whether actions taken by government are constitutional.
This includes reviewing:
legislation
government programmes
executive orders and other executive actions
Edexcel's 2023 mark scheme explicitly identifies judicial review as a mechanism capable of preventing the executive or legislature from exceeding its constitutional authority.
This means that an attempt by a President to overcome congressional resistance through executive action may still face a judicial check.
Example: Biden and student loan forgiveness
The 2025 Edexcel mark scheme uses President Biden's student loan forgiveness scheme as an example of presidential action being prevented through the constitutional system.
The example demonstrates that:
presidential policy ambition does not itself determine constitutional authority
executive action can be challenged
the judiciary can restrict presidential attempts to achieve a policy goal
presidential effectiveness depends partly on the relationship between the executive and judiciary
This is a strong example to use when explaining why presidential power can vary despite Presidents occupying the same constitutional office.
The Supreme Court can also strengthen presidential influence
The relationship is not always confrontational.
A Supreme Court may uphold presidential action or interpret the Constitution in a way compatible with the President's objectives.
Presidents who have opportunities to nominate several justices may also have a greater opportunity to influence the Court's ideological balance over the longer term. Edexcel's mark schemes recognise that multiple appointments can alter the ideological composition of the Court for years after the President leaves office.
Therefore the Court is both:
a potential limitation on presidential power
an institution over which Presidents can exercise some long-term indirect influence
The key word is indirect. Appointment does not mean control.
Divided government
Divided government occurs when the House of Representatives, Senate and presidency are not all controlled by one party.
This is one of the most important reasons presidential power varies.
Under divided government, an opposition party controls at least one part of Congress.
This may make it harder for the President to:
secure passage of legislation
obtain funding
gain approval for appointments
negotiate support for major initiatives
avoid aggressive congressional scrutiny
The President may therefore become more reliant on persuasion, bargaining and informal influence.
Divided government and gridlock
Divided government can contribute to gridlock.
Edexcel defines gridlock as a situation where the President and Congress prevent one another from acting, producing difficulty in passing legislation.
The relationship can be expressed as:
different party control → stronger institutional conflict → difficulty reaching agreement → potential gridlock → reduced presidential legislative effectiveness
This does not mean divided government always produces complete paralysis.
Compromise remains possible. However, divided government creates stronger structural opportunities for Congress to resist presidential objectives.
Example: Trump and the border-wall funding dispute
An Edexcel mark scheme cites Trump and the federal shutdown over funding for the Mexico border wall when illustrating the difficulties Presidents can face when congressional opposition prevents them obtaining support for their agenda.
This illustrates two major limitations working together:
divided political control
congressional financial power
The President had a policy objective, but congressional control over funding created a major obstacle.
Unified government
The opposite situation is unified government.
When the President's party controls both chambers of Congress, presidential power may increase because the legislative and executive branches have greater partisan alignment.
Edexcel mark schemes recognise that legislation and compromise may be easier when the presidency and both congressional chambers are controlled by one party.
However:
unified government ≠presidential dictatorship
Checks and balances still exist, members of Congress remain independently elected and political divisions can remain within the President's own party.
A strong answer therefore avoids absolute claims such as:
"A President with unified government can pass whatever they want."
That ignores separation of powers.
The election cycle
Edexcel explicitly requires students to understand the election cycle as a limitation on presidential power.
US politicians operate under different electoral timetables.
In particular, mid-term elections are congressional elections held halfway through a President's four-year term.
Elections matter because members of Congress are accountable to their own voters rather than to the President.
Congressional elections and presidential power
Members of the House of Representatives face a particularly short electoral cycle.
Edexcel mark schemes emphasise that this can encourage representatives to focus strongly on their constituents and re-election.
This can limit presidential power because a representative may ask:
Will supporting the President help me win my next election?
rather than:
Does the President want me to vote for this?
Even politicians from the President's party may therefore oppose presidential policy where their own electoral interests point in a different direction.
Elections can alter the President's political circumstances
The constitutional powers of the presidency do not change after a congressional election.
However, the political environment in which those powers operate can change dramatically.
If an election produces divided government:
congressional resistance may increase
oversight may become stronger
presidential legislation may become more difficult
persuasion becomes more important
executive action may become more attractive to the President
If the President's party controls Congress, legislative cooperation may instead become easier.
This is one of the clearest reasons that presidential power changes during a term of office.
Proximity to an election
The approaching election itself can also affect institutional relationships.
Members of Congress may become increasingly concerned with:
their own re-election
the preferences of constituents
the popularity of the President
whether association with a presidential proposal will help or damage them electorally
Edexcel mark schemes recognise that the proximity of elections affects congressional behaviour and that presidents may have additional leverage or additional difficulties during election periods.
The Garland appointment dispute under Obama also demonstrates how the proximity of a presidential election can affect the relationship between the presidency, Senate and Supreme Court appointment process.
Presidential power changes over the term in office
One of the most important points in section 3.3 is that presidential power is not static.
Edexcel requires students to study the "changing nature of power over their term in office".
There is no simple rule that every President automatically becomes more or less powerful as their presidency continues.
Instead, several factors interact.
Factor | Possible effect on presidential power |
Electoral mandate | May increase political authority |
Congressional party control | Can increase or reduce legislative cooperation |
Divided government | Can strengthen congressional resistance and oversight |
Mid-term elections | Can alter the political balance between President and Congress |
Supreme Court appointments | May give the President long-term indirect influence |
Judicial review | May restrict presidential action |
National events | May expand or reduce opportunities for leadership |
Presidential persuasion | Can affect the ability to negotiate with political actors |
Partisanship | May make cooperation or opposition more intense |
This is why understanding the Executive Office and other presidential resources is only part of understanding presidential power. Resources matter only within a wider political environment.
Why presidential power varies between presidents
The constitutional presidency remains broadly the same, but Presidents operate under very different conditions.
Presidential power therefore varies because of a combination of:
1. The composition of Congress
A President facing friendly congressional majorities may find it easier to pursue legislation.
A President facing divided government may encounter stronger resistance.
2. The election cycle
Mid-term and presidential elections can change party control, incentives and congressional behaviour.
3. The Supreme Court
Different Presidents encounter different ideological balances on the Court and different opportunities to make appointments.
4. Political circumstances
Major national events and political controversies can change the President's ability to exercise leadership.
5. The President's ability to persuade
Because Presidents cannot simply command Congress, political skill and relationships can affect their effectiveness.
6. The policy area
Presidential influence may vary between domestic and foreign policy because the constitutional powers and institutional relationships involved are different.
This final point becomes particularly important in Interpretations and debates of the US presidency.
Presidential power can "ebb and flow"
The 2022 examiner report is especially useful for understanding this lesson.
Examiners praised the strongest candidates for recognising that presidential power can ebb and flow depending on circumstances, rather than treating Presidents as permanently powerful or permanently weak. Successful responses considered the political climate, divided government, partisanship and the President's stage in their term of office.
This gives you an excellent overall principle for essays:
Presidential power is best understood as conditional rather than fixed. Constitutional authority establishes what Presidents can potentially do, while relationships with Congress and the Supreme Court, party control and the election cycle determine how effectively those powers can actually be exercised.
Hints from the Examiner Reports đź’ˇ
Examiner hint:Â Do not simply list presidential powers and then list their limitations. The 2022 report found that weaker answers were often narrative, whereas stronger answers directly connected each presidential power to the institution or circumstance that could restrict it.
Examiner hint:Â Explain why presidential power changes. The strongest 2022 responses discussed how power could ebb and flow according to political circumstances, the presidential term, divided government and partisanship. This is at the heart of this lesson.
Examiner hint:Â Use Congress and the Supreme Court as part of the argument rather than treating them as separate mini-essays. High-level responses drew evidence from all three branches and analysed how their powers interacted.
Examiner hint:Â Keep every paragraph focused on the exact judgement required. The 2025 report noted that weaker responses sometimes discussed presidential appointments, elections or Supreme Court powers without explaining how these related to the specific question about presidential accountability.
Examiner hint:Â Consider the willingness of Congress to use its powers as well as whether those powers exist. Top-level 2025 responses considered the makeup of Congress and the political context of the President's term when assessing congressional oversight.
Examiner hint:Â Avoid factual errors about constitutional mechanisms. Examiner reports have specifically warned against claiming that ordinary legislation needs a two-thirds congressional majority, that Congress "vetoes" a presidential veto, or that Congress can simply revoke executive orders.
Common Mistakes ⚠️
Mistake: Assuming the President controls Congress when their party has a majority
Why this is incorrect: Congress is constitutionally separate from the executive. Its members are independently elected and may have different constituency or political priorities.
How to improve: Say that unified government can increase the likelihood of cooperation, rather than guaranteeing presidential control.
Mistake: Treating divided government as automatic gridlock
Why this is incorrect: Divided government creates stronger opportunities for conflict but does not make cooperation impossible.
How to improve: Explain that divided government may increase resistance and gridlock, then analyse the importance of negotiation and persuasion.
Mistake: Assuming Supreme Court appointments give the President control of the Court
Why this is incorrect: Presidents nominate justices, but once appointed the justices are institutionally independent.
How to improve: Describe appointment as a source of long-term indirect influence, not direct presidential command.
Mistake: Saying the Supreme Court can simply overturn presidential action because it dislikes the policy
Why this is incorrect: The Court's relevant power is judicial review, based on constitutionality.
How to improve: Explain the constitutional reasoning: an executive action may be restricted if the Court finds that it exceeds constitutional authority.
Mistake: Ignoring the election cycle
Why this is incorrect: Edexcel specifically requires the election cycle and changing presidential power over a term to be studied.
How to improve: Ask how congressional elections, re-election incentives and the proximity of elections affect presidential relationships with Congress.
Mistake: Assuming presidential power always declines over time
Why this is incorrect: The specification asks students to understand the changing nature of power, not an automatic decline.
How to improve: Analyse the circumstances. Party control, elections, Supreme Court decisions, political events and presidential skill can make power rise or fall during a term.
Mistake: Giving examples without explaining their significance
Why this is incorrect: Knowing an example is AO1. Higher-level responses need analysis and evaluation.
How to improve: After an example, explain:
What limitation does this demonstrate? → How much did it restrict the President? → What does this show about presidential power overall?
Exam-Style Questions ✍️
Question 1
Define divided government. (1 mark)
reveal mark scheme and indicative content
Answer: A situation in which the House of Representatives, Senate and presidency are not all controlled by the same political party.
Question 2
State one constitutional institution that can limit presidential power. (1 mark)
reveal mark scheme and indicative content
Answer:
Accept:
Congress
the Supreme Court
Question 3
Explain two ways in which Congress can limit presidential power. (6 marks)
reveal mark scheme and indicative content
Indicative mark scheme:
Credit developed explanations such as:
Presidents depend on Congress to pass legislation.
Congress controls funding for presidential programmes.
Congress may override a presidential veto with two-thirds majorities in both chambers.
The Senate must ratify formal treaties by a two-thirds majority.
Senate involvement in appointments limits unilateral presidential appointment power.
Congress may use oversight to hold the executive to account.
Higher-quality answers explain how the congressional power restricts presidential effectiveness.
Question 4
A President is elected promising a major domestic reform. Two years later, the opposing party controls one chamber of Congress and refuses to advance the President's proposal.
Analyse how the election cycle has affected presidential power. (6 marks)
reveal mark scheme and indicative content
Indicative mark scheme:
A strong response should explain that:
presidential constitutional powers have not changed
congressional elections can change the political composition of government
opposition control produces divided government
the President remains dependent on Congress for legislation
persuasion and bargaining become more important
the example demonstrates how presidential power can change during a term despite the office itself remaining constitutionally unchanged
Question 5
A President issues an executive action after Congress refuses to pass a policy. The Supreme Court later considers whether the President acted within constitutional limits.
Explain what this scenario demonstrates about presidential power. (6 marks)
reveal mark scheme and indicative content
Indicative mark scheme:
Credit explanation that:
executive action may allow Presidents to act despite congressional resistance
this may temporarily increase presidential independence
the Supreme Court remains an independent constitutional check
judicial review can assess whether executive action is constitutional
presidential power is therefore significant but constrained by checks and balances
Question 6
Analyse why divided government can reduce presidential power. (12 marks)
reveal mark scheme and indicative content
Indicative mark scheme:
Relevant arguments include:
an opposition-controlled chamber may refuse to advance presidential legislation
congressional control over funding may restrict presidential programmes
congressional oversight may become stronger
appointments may face greater resistance
divided government can increase the likelihood of gridlock
the President may become more dependent on persuasion and negotiation
Strong answers should also recognise that divided government does not remove formal presidential powers such as the veto or executive authority.
Question 7
Analyse how the Supreme Court can both limit and strengthen presidential influence. (12 marks)
reveal mark scheme and indicative content
Indicative mark scheme:
Ways the Court may limit presidential power:
judicial review can restrict unconstitutional executive action
justices are independent once appointed
Presidents cannot overrule Supreme Court decisions
Ways presidential influence may be strengthened:
Presidents nominate Supreme Court justices
appointments can alter the Court's ideological balance
multiple appointments may create influence extending beyond a President's term
the Court may uphold presidential action
A strong response should distinguish between influence over appointments and control over judicial decisions.
Question 8
Evaluate the view that divided government is the most significant limitation on presidential power. (30 marks)
reveal mark scheme and indicative content
Indicative mark scheme:
Arguments supporting the view may include:
opposition congressional control makes presidential legislation harder to secure
Congress can deny or restrict funding
congressional oversight may be stronger
appointments and treaties may face increased resistance
divided government can contribute to gridlock
Presidents become more reliant on informal persuasion rather than command
Arguments challenging the view may include:
the Constitution creates limitations even under unified government through separation of powers
Congress retains independent constitutional powers regardless of party control
the Supreme Court can restrict executive action through judicial review
election-cycle pressures may cause members of the President's own party to resist presidential objectives
Supreme Court appointments and decisions can shape presidential effectiveness
Presidents retain important formal and informal powers even during divided government
Evidence may include:
Obama and Trump having to work with Congress over healthcare policy
Senate opposition affecting Obama's Supreme Court appointment opportunity
Trump and congressional conflict over border-wall funding
Biden's student loan forgiveness policy being prevented through the constitutional system
For higher-level evaluation:
Do not simply rank the factors.
A stronger judgement should explain when each limitation becomes particularly significant. For example, divided government may be the strongest constraint on legislative goals, while the Supreme Court may become more important when a President relies heavily on executive action.
The strongest responses should recognise that presidential power changes according to the interaction between constitutional rules and political circumstances. This reflects examiner praise for candidates who showed how presidential power can "ebb and flow" over time rather than treating it as fixed.
Comments