3.2.1.4 - US Supreme Court - Appointment, Composition and Power

Constitutional Role

The US Supreme Court is the highest court in the federal judiciary. In AQA Politics, it matters because it is not simply a legal appeal court: it is also a constitutional actor. It interprets the Constitution, settles major legal disputes and can rule that laws or executive actions are unconstitutional.

The Court is part of the separation of powers. Congress makes federal law, the President executes law, and the federal courts interpret and apply law in cases before them. The Supreme Court sits at the top of that judicial branch. Its constitutional role is to act as guardian and interpreter of the Constitution, including the Bill of Rights and later amendments.

Judicial review is the key power.

If the Court finds a conflict, the unconstitutional action cannot stand. This is why the US Supreme Court is much more constitutionally powerful than an ordinary appeal court.

The power is still bounded. The Court does not issue general political advice to Presidents or Congress. It decides "cases" and "controversies", meaning legal disputes brought by litigants. It cannot simply announce a view on a policy question because the Justices feel it is politically important.

Three related terms need careful separation.

Strict and loose constructionism are about interpretation. Strict constructionism means interpreting the Constitution narrowly, often with close attention to text and original meaning. Loose constructionism means interpreting broad constitutional principles more flexibly so they can apply to new conditions. Do not assume strict construction always means restraint. A strict constructionist judge may still be activist if they are willing to strike down legislation that conflicts with their reading of the Constitution.

Appointment And Confirmation

Supreme Court appointments are a shared power between the President and the Senate. Article II gives the President the power to nominate Judges of the Supreme Court, but appointment requires the advice and consent of the Senate. This makes the process a check and balance: no President can place a Justice on the Court alone.

The process normally moves through four stages.

This process gives the Court democratic roots. The President is nationally elected and senators are elected state representatives. A Justice is not elected directly, but the appointment process passes through elected institutions. That is one argument for the Court's legitimacy.

The same process also politicises the Court. Presidents know Supreme Court appointments can shape abortion, gun rights, executive power, federalism, religious liberty, voting rights and criminal justice. Senators know this too. Confirmation hearings often become arguments about what kind of constitutional future the country should have.

Recent confirmation history shows this shift. John Roberts was confirmed 78-22 in 2005, Sonia Sotomayor 68-31 in 2009 and Elena Kagan 63-37 in 2010. More recent confirmations have often been narrower: Neil Gorsuch 54-45 in 2017, Brett Kavanaugh 50-48 in 2018, Amy Coney Barrett 52-48 in 2020 and Ketanji Brown Jackson 53-47 in 2022. The 2016 Garland nomination also shows Senate power because the Judiciary Committee took no action, leaving the vacancy for the next President.

For AQA, the key point is not simply "appointments are political". It is more precise to say: the appointment process is constitutional and democratic, but modern party polarisation has made it a major route through which elected politicians try to shape judicial interpretation.

Composition And Life Tenure

As of 22 June 2026, the Supreme Court has nine members: one Chief Justice and eight Associate Justices. The number has been fixed at nine since 1869, though Congress has the legal power to change the size of the Court by statute.

This composition matters in two ways.

First, it affects interpretation. Six current Justices were nominated by Republican presidents and three by Democratic presidents. That does not mean every case is a party-line vote. It does mean Presidents have had a powerful long-term effect on the Court's personnel and likely constitutional direction.

Second, it affects legitimacy. The Court can claim constitutional legitimacy because its members were appointed through the process set out in the Constitution. But critics can ask whether a life-tenured Court with a clear appointment pattern should be able to make decisions with huge policy effects.

Life tenure is central.