Yes. The Supreme Court can overturn a law passed by Congress if it finds the law violates the Constitution, and once the Court says so, the law becomes unenforceable everywhere in the country. The power is called judicial review, and it has been part of American governance since 1803. It is not automatic, though. Someone with a real personal stake has to sue, lose or win through the lower courts, and then persuade at least four of the nine justices that the case is worth hearing before the Court will consider the constitutional question at all.
Where the Power Comes From
Nothing in the Constitution explicitly gives the Court authority to strike down acts of Congress.1National Archives. Marbury v. Madison (1803) The Court claimed that authority for itself in Marbury v. Madison, when Chief Justice John Marshall wrote that a provision of the Judiciary Act of 1789 conflicted with Article III and had to give way. His opinion contained the line courts have repeated ever since: “It is emphatically the province and duty of the Judicial Department to say what the law is.”2Justia. Marbury v. Madison, 5 U.S. 137 (1803) That case created the doctrine every court still uses when it evaluates whether Congress has crossed a constitutional line.3U.S. Courts. Two Centuries Later: The Enduring Legacy of Marbury v. Madison (1803)
How a Challenge Actually Reaches the Court
The Court never reviews a law on its own initiative. Article III limits federal courts to real “cases” and “controversies,” so an actual lawsuit has to exist before any judge weighs in.4Cornell Law School. U.S. Constitution Annotated Article III Section 2 Clause 1 – Overview of Cases and Controversies The Court will not issue advisory opinions, and it will not hear hypothetical complaints about what a law might do to someone in the future.
The person suing has to demonstrate what courts call standing. That means three things: an actual or threatened injury, a clear link between the injury and the law being challenged, and a realistic chance that a court ruling would fix the problem.5Legal Information Institute. Standing Requirement: Overview – Article III Section 2 Clause 1 Standing kills more constitutional challenges than most people expect. Objecting to a law on principle is not enough. The law has to have done something to you.
Assuming standing is there, the case starts in a U.S. District Court. The losing side can appeal to one of the regional U.S. Circuit Courts of Appeals. Only after that can the losing party ask the Supreme Court to step in, by filing a petition for a writ of certiorari, which is a formal request that the Court review the lower ruling.6Cornell Law School. Rule 14 – Content of a Petition for a Writ of Certiorari The docket fee for filing that petition is $300.7Supreme Court of the United States. Memorandum to Those Intending to Prepare a Petition for a Writ of Certiorari in Booklet Format Petitioners who cannot afford it can move to proceed in forma pauperis by showing financial hardship.8Supreme Court of the United States. Guide to Filing In Forma Pauperis Cases
The Court receives roughly 7,000 to 8,000 petitions each term and agrees to hear fewer than 100. At least four of the nine justices must vote to grant review, a tradition known as the Rule of Four. Cases that get taken usually involve conflicts among the circuit courts, questions of broad national importance, or constitutional issues the Court considers ready for definitive resolution.
What Grounds Justify Striking a Law Down
Courts start from the assumption that any law Congress passes is constitutional. This is called the presumption of constitutionality, and it puts the burden on the challenger. A court will uphold a law if Congress could reasonably have concluded it had the power to enact it, even if the supporting facts are debatable. Overturning a federal statute is a genuinely uphill fight.
When challenges do succeed, they usually fall into a few categories. The most common is that the law violates a specific constitutional right. A law restricting speech runs into the First Amendment. A law imposing criminal penalties without adequate procedure clashes with the Fifth or Fourteenth. How hard the government has to work to defend the law depends on what right or classification is involved. Courts apply three levels of review:
- Rational basis is the lowest standard, used for most economic and social legislation. The government need only show the law is rationally related to a legitimate purpose. Most laws survive.
- Intermediate scrutiny applies to laws that classify people by gender or similar characteristics. The government must show the law serves an important interest and is substantially related to achieving it.
- Strict scrutiny is the most demanding standard, triggered when a law burdens a fundamental right or classifies by race, religion, or national origin. The government must prove a compelling interest and show the law is narrowly tailored as the least restrictive means available. Most laws that face strict scrutiny do not survive it.
A law can also fall because Congress exceeded the powers the Constitution grants it. Commerce Clause authority is broad but has limits. In United States v. Lopez (1995), the Court struck down the Gun-Free School Zones Act because possessing a firearm near a school had no substantial connection to interstate commerce, and Congress had no other constitutional basis for the statute.9Library of Congress. Table of Laws Held Unconstitutional in Whole or in Part by the Supreme Court
Separation of powers is another basis. If Congress passes a law that intrudes on the executive branch or tries to keep for itself powers the Constitution assigns elsewhere, the Court can invalidate it to preserve the structural balance the framers built.
Facial Versus As-Applied Challenges
Not every successful challenge kills the entire statute. A facial challenge argues the law is unconstitutional in all possible applications, and winning takes the whole thing down. An as-applied challenge argues the law is unconstitutional only in the plaintiff’s particular circumstances. Winning that produces a narrower ruling: the statute stays alive, but it cannot be enforced the way the court just condemned.
When the Court Will Not Step In
Some questions are off the table regardless of how strong the constitutional argument is. Under the political question doctrine, federal courts refuse to hear cases they consider committed to Congress or the President. Foreign policy is the classic example. If a lawsuit asks the Court to second-guess a decision the Constitution assigns to another branch, the Court will decline to decide it.
What Happens When the Court Strikes a Law Down
When the Supreme Court declares a federal law unconstitutional, the ruling takes effect immediately. The statute becomes unenforceable, and every lower federal and state court is bound by the decision. The text of the law stays on the books, because only Congress can formally repeal a statute, but it carries no legal force.
The Court does not always take down an entire law. Under the severability doctrine, if one provision is unconstitutional but the rest can function on their own, courts will try to save the surviving portions. The test looks at whether the remaining provisions can operate independently and whether Congress would have passed them without the invalidated piece. Many complex federal statutes include a severability clause telling courts to preserve the rest of the law if any single provision fails.
A ruling that a law is unconstitutional reaches backward as well as forward. For any case still on direct appeal when the decision comes down, the new constitutional rule applies in full, regardless of when the events happened.10Legal Information Institute. Harper v. Virginia Department of Taxation, 509 U.S. 86 (1993) So if you were convicted under a statute later held unconstitutional and your appeal was still pending, you benefit. Once a conviction is final and you are seeking relief through habeas or a similar collateral challenge, the picture shifts. Courts generally will not apply new procedural rules retroactively in those situations, but they will apply new substantive rules. If the Court holds that the Constitution forbids punishing the conduct you were convicted of, you can seek relief even after direct appeals are exhausted.11Legal Information Institute. Retroactivity of Criminal Decisions – Article III Section 1
What Congress Can Do in Response
Congress is not powerless once the Court invalidates a law. The most common response is to pass a revised version that fixes the specific constitutional flaws the Court identified. If the law was too broad, Congress narrows it. If it lacked adequate procedural protections, Congress adds them. This back-and-forth is a normal part of how the system operates.
A key distinction shapes how far Congress’s options go. When the Court strikes a law down on constitutional grounds, Congress cannot simply override the decision with new legislation. The constitutional interpretation stands unless the Court itself later reverses course. But when the Court merely interprets a statute in a way Congress dislikes, without finding it unconstitutional, Congress can amend the statutory language and effectively override the reading. Many disputes that look like the Court “striking down” a law are actually statutory interpretation cases where Congress has a straightforward legislative fix.
For true constitutional rulings, the ultimate response is amending the Constitution itself. Article V requires a two-thirds vote in both the House and Senate to propose an amendment, followed by ratification by three-fourths of the states.12National Archives. Article V, U.S. Constitution It has happened. The Fourteenth Amendment overturned the Dred Scott decision, and the Twenty-Sixth Amendment overrode a ruling that Congress lacked power to lower the voting age for state elections. The bar is deliberately high, which is why most constitutional rulings endure.
Federal Laws the Court Has Struck Down
A few well-known cases show the pattern in action:9Library of Congress. Table of Laws Held Unconstitutional in Whole or in Part by the Supreme Court
- The Gun-Free School Zones Act (1995). In United States v. Lopez, the Court held Congress exceeded its Commerce Clause power by making it a federal crime to possess a firearm near a school.
- The Defense of Marriage Act (2013). In United States v. Windsor, the Court struck down the federal definition of marriage as between one man and one woman, finding it violated the equal protection principles of the Fifth Amendment.
- The Stolen Valor Act (2012). In United States v. Alvarez, the Court ruled that criminalizing false claims of military decorations violated the First Amendment, even though the speech was a lie.
Each case followed the same route. A person harmed by the law sued, lost or won in the lower courts, and eventually convinced at least four justices to take the case. The Library of Congress maintains a complete table of every federal provision the Court has ever invalidated, and it spans more than two centuries of American law.