The Supreme Court and Congress check each other through a set of specific, constitutionally grounded tools: the Court can declare an act of Congress unconstitutional, and Congress can rewrite statutes the Court misreads, resize the Court, shape its jurisdiction, control its budget, confirm or impeach its justices, and in the last resort amend the Constitution itself. Neither branch gets a permanent last word, and the balance between the Supreme Court and Congress is the result of that ongoing push and pull rather than any single clause in the text.
What the Court Can Do to Congress
The Court’s heaviest tool is judicial review: the authority to examine a federal statute and declare it unconstitutional. A law the Court strikes down is void, and the executive branch stops enforcing it. The Constitution does not spell this power out. Chief Justice John Marshall claimed it for the judiciary in Marbury v. Madison (1803), writing that it is “emphatically the province and duty of the Judicial Department to say what the law is.”1Constitution Annotated. ArtIII.S1.3 Marbury v. Madison and Judicial Review
Marshall’s reasoning was straightforward. A written constitution is the supreme law of the land, so when an ordinary statute contradicts it, someone has to decide which controls. More than two centuries of practice have cemented that answer. For Congress, this means drafting a law is only half the job; the statute still has to survive a challenge in court.
Judicial review has a self-imposed limit worth flagging, because it marks territory the Court will not enter. Under the political question doctrine, federal courts decline to rule on disputes they consider committed to Congress or the President rather than to the judiciary. In Baker v. Carr (1962), the Court identified factors signaling a political question, including whether the Constitution textually assigns the issue to another branch and whether workable legal standards exist for a court to apply.2Constitution Annotated. ArtIII.S2.C1.9.1 Overview of Political Question Doctrine When a matter qualifies, courts lose jurisdiction, and Congress’s own judgment stands.
What Congress Can Do to the Court
Congress cannot overrule a constitutional decision with a simple statute, but it holds structural power over how the federal judiciary is organized, funded, and staffed. Those levers add up.
Setting the Size of the Court
The Constitution creates the Supreme Court but says nothing about how many justices sit on it. Congress has changed that number repeatedly. The Judiciary Act of 1789 set the Court at six members. Over the next eighty years, Congress expanded the bench to as many as ten justices during the Civil War, briefly reduced it, and fixed the number at nine in 1869.3Congress.gov. ArtIII.S1.8.3 Size of the Supreme Court The number is not locked in by the Constitution.
The most famous attempt to change it came in 1937, when President Franklin Roosevelt proposed adding one new justice for every sitting justice over 70, up to six additional seats. Roosevelt wanted to dilute a Court that kept striking down his New Deal programs. Congress refused to pass the bill, and Roosevelt took a major political hit for the attempt.4Federal Judicial Center. FDR’s Court-Packing Plan The episode showed that while Congress technically has the power to pack the Court, the political price can be steep.
Controlling Appellate Jurisdiction
Article III gives the Supreme Court appellate jurisdiction “with such Exceptions, and under such Regulations as the Congress shall make.” The Exceptions Clause allows Congress to decide which categories of cases the Court can hear on appeal from lower courts.5Constitution Annotated. ArtIII.S2.C2.6 Exceptions Clause and Congressional Control over Appellate Jurisdiction In theory, Congress could strip the Court’s ability to hear appeals in an entire subject area. The outer limits of that power have never been fully tested, but even the threat of jurisdiction-stripping has shaped debates over civil rights and immigration.
Creating and Abolishing Lower Courts
Every federal court below the Supreme Court exists because Congress chose to create it. The first Congress established thirteen district courts in 1789, and the legislature has reorganized the lower judiciary multiple times since, adding circuit courts, abolishing old ones, and creating the modern courts of appeals in 1891.6Constitution Annotated. ArtIII.S1.8.4 Establishment of Inferior Federal Courts Because Congress controls whether lower courts exist at all, it also defines their jurisdiction and structure.
Funding and the Compensation Clause
Congress sets the annual budget for the entire federal judiciary, including courthouse operations, staffing, and judicial salaries. That financial oversight is a real check, because courts without adequate funding cannot function. One limit applies: the Compensation Clause in Article III provides that judges’ pay “shall not be diminished during their Continuance in Office.”7Constitution Annotated. ArtIII.S1.10.3.2 Compensation Clause Doctrine Federal courts have interpreted that language to mean Congress cannot retroactively cancel cost-of-living adjustments for sitting judges either.8United States Courts. Judicial Compensation Congress cannot use salaries to punish judges for unpopular decisions.
Rewriting a Statute the Court Misread
When the Court interprets a federal statute in a way Congress did not intend, Congress can pass a new law that changes the result. In a statutory case, the Court’s job is to figure out what Congress meant; if Congress says the Court got it wrong, Congress can rewrite the text.
The Lilly Ledbetter Fair Pay Act of 2009 is the standard example. In Ledbetter v. Goodyear Tire, the Court held that the clock for filing a pay discrimination claim started when the employer first made the discriminatory pay decision, not each time the employee received a smaller paycheck. Congress disagreed and passed a law providing that each discriminatory paycheck resets the filing deadline.9U.S. Equal Employment Opportunity Commission. Lilly Ledbetter Fair Pay Act of 2009 The Court’s interpretation was superseded almost immediately.
An earlier instance involved civil rights. In Grove City College v. Bell (1984), the Court narrowly interpreted antidiscrimination laws to cover only the specific program receiving federal money, not the entire institution. Congress responded with the Civil Rights Restoration Act of 1987, broadening coverage to all operations of any institution that receives federal funds. In both cases, the legislative fix was a regular statute passed by majority vote and signed by the President. Statutory interpretations leave Congress with the final word on what the law means.
Amending the Constitution
When a decision rests on the Constitution itself rather than a statute, Congress cannot fix it with ordinary legislation. The only route is a constitutional amendment. Article V requires a two-thirds vote in both the House and the Senate just to propose one.10Constitution Annotated. ArtV.1 Amending the Constitution After that, three-quarters of the states must ratify it before it becomes part of the Constitution.11National Archives. U.S. Constitution – Article V
The 16th Amendment is the textbook case. In 1895, the Supreme Court struck down a federal income tax. Congress proposed a constitutional amendment explicitly granting the power to tax income, and ratification followed in 1913.12National Archives. 16th Amendment to the U.S. Constitution – Federal Income Tax The supermajority thresholds make this path rare, but it means no Supreme Court ruling is permanent if the political will to change it is strong enough.
Confirming and Impeaching Justices
Congress shapes the Court most directly through the people who sit on it. The President nominates justices, and Article II requires the Senate’s “advice and consent” before any nominee takes the bench.13Congress.gov. Constitution Annotated – Article II Section 2 Since 2017, a simple majority vote is enough to confirm a Supreme Court nominee after the Senate eliminated the filibuster for those appointments. That change made it easier for a Senate aligned with the President to push nominees through over minority objections.
Because justices serve for life, each confirmation can shape the Court’s direction for decades. The Senate has rejected or effectively killed roughly one in five Supreme Court nominations throughout American history, so the vote is far from a formality.
On the removal side, the Constitution provides that federal judges serve “during good Behaviour.” Article I gives the House the sole power to impeach and the Senate the sole power to try the case.14Constitution Annotated. U.S. Constitution – Article I Conviction requires a two-thirds Senate vote and results in immediate removal, and the grounds are “Treason, Bribery, or other high Crimes and Misdemeanors.”15Constitution Annotated. Article II Section 4 Only one Supreme Court justice has ever been impeached, Samuel Chase in 1804. The Senate acquitted him in 1805, and no justice has been removed this way.16Federal Judicial Center. Samuel Chase Impeached Impeachment is a live constitutional option, but as a practical matter it functions more as a background threat than an active check.
Why Enforcement Depends on the Other Branches
The Supreme Court has no army, no police force, and no independent means of enforcing its decisions. When the Court rules, it relies on the executive branch to carry the order out. That arrangement usually works because of a strong cultural expectation that officials will comply with court orders, but when compliance breaks down the Court is largely helpless on its own.
Two episodes capture the range. In 1957, Arkansas defied a federal court order to desegregate Central High School in Little Rock; President Eisenhower sent the 101st Airborne Division to enforce the order. More than a century earlier, after Worcester v. Georgia in 1832 ruled in favor of Cherokee sovereignty, President Andrew Jackson declined to enforce the decision, and Georgia ignored the ruling.17Federal Judicial Center. Executive Enforcement of Judicial Orders The Court had no way to compel compliance by itself. The practical effect of a ruling can depend on whether Congress funds it and whether the executive enforces it.
Oversight of Court Procedures
Congress also runs a quieter line of oversight through the Rules Enabling Act, which gives the Supreme Court authority to write the procedural rules governing federal litigation. Under the Act, the Court can create and amend rules of practice, procedure, and evidence for the district courts and courts of appeals.18Office of the Law Revision Counsel. 28 USC 2072 – Rules of Procedure and Evidence; Power to Prescribe Those rules cannot change anyone’s substantive legal rights, and Congress can block, modify, or delay a proposed rule by passing legislation before it takes effect.19Congressional Research Service. Congress, the Judiciary, and Civil and Criminal Procedure It is a smaller lever than judicial review or the amendment power, but it is one more place where the two branches operate on the same terrain, each with a say.