The power of judicial review lets the Supreme Court refuse to enforce a federal statute, a presidential action, a federal agency rule, or a state law when it concludes that measure conflicts with the Constitution. The authority is not written into the Constitution’s text, but it has anchored American government since 1803 and reaches every branch and every level of the system. No law or official action is truly settled until the courts confirm it fits within constitutional limits.
Strike Down Acts of Congress
The most familiar use of the power is invalidating a federal statute. Chief Justice John Marshall established this authority in Marbury v. Madison, 5 U.S. 137 (1803), writing that “it is emphatically the province and duty of the Judicial Department to say what the law is.”1Justia. Marbury v. Madison, 5 U.S. 137 Marshall’s reasoning was direct: the Constitution is the supreme law, and any ordinary statute that contradicts it is void. If courts had to enforce a law that violated the Constitution, the Constitution would be meaningless as a limit on government.
Congress draws its authority from the powers listed in Article I, Section 8.2Constitution Annotated. Article I Section 8 Enumerated Powers When a statute reaches beyond those powers or violates a constitutional right, the Court can declare it invalid. The statute stays on the books, but it can no longer be enforced against anyone.
This happens regularly. The federal definition of marriage in the Defense of Marriage Act fell in United States v. Windsor (2013). Restrictions on corporate independent expenditures were invalidated in Citizens United v. FEC (2010). The Affordable Care Act’s mandatory Medicaid expansion was struck down in National Federation of Independent Business v. Sebelius (2012).3Constitution Annotated. Table of Laws Held Unconstitutional in Whole or in Part by the Supreme Court Each of those rulings pulled a provision Congress had passed through the normal legislative process.
When a federal law is struck down, Congress can rewrite the statute to avoid the constitutional problem or pursue the far harder route of amending the Constitution itself.
Invalidate Presidential and Executive Branch Actions
The Court also evaluates whether the President has stayed within the authority the Constitution grants the executive branch. The leading case is Youngstown Sheet & Tube Co. v. Sawyer, 343 U.S. 579 (1952). President Truman seized private steel mills during the Korean War to stop a labor strike from disrupting production, and the Court invalidated the seizure, holding that “the Order was not authorized by the Constitution or laws of the United States, and it cannot stand.”4Justia. Youngstown Sheet and Tube Co. v. Sawyer, 343 U.S. 579 Seizing private property to settle a labor dispute was a lawmaking function that belonged to Congress.
Executive orders face the same test. An order draws its authority either from a constitutional power the President already holds or from a statute Congress has passed. An order that reaches beyond both sources, or that violates a constitutional right such as free speech or equal protection, can be struck down.
Review of Federal Agency Rules
Federal agencies operate on authority Congress delegates through statutes. When an agency reads its governing statute and writes rules based on that reading, those rules are subject to judicial review too. If a regulation goes beyond what Congress authorized, the Court can void it.
For forty years, courts gave agencies significant leeway under Chevron deference: when a statute was ambiguous, courts deferred to the agency’s reasonable interpretation. The Supreme Court overruled that approach in Loper Bright Enterprises v. Raimondo, 603 U.S. ___ (2024), holding that courts must “exercise their independent judgment in deciding whether an agency has acted within its statutory authority” and may not defer to an agency simply because a statute is ambiguous.5Justia. Loper Bright Enterprises v. Raimondo, 603 U.S. ___ (2024) Federal regulations now face tougher judicial scrutiny than at any point in recent decades.
Overturn State Laws That Conflict With the Constitution
Judicial review reaches state legislatures and state courts. The Supremacy Clause in Article VI provides that the Constitution and federal laws “shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.”6Constitution Annotated. Article VI Clause 2 Supremacy Clause When a state law conflicts with the Constitution or with valid federal law, the state law loses.
Without this oversight, a state could restrict political speech or eliminate the right to a jury trial, and residents would have no federal recourse. The Court’s review keeps constitutional protections consistent across all fifty states.
The reach into state government grew wider through selective incorporation, in which the Court used the Fourteenth Amendment’s Due Process Clause to apply most Bill of Rights protections against state governments.7Constitution Annotated. Early Doctrine on Incorporation of the Bill of Rights Case by case, the Court incorporated the right to counsel in Gideon v. Wainwright (1963), protection against unreasonable searches in Mapp v. Ohio (1961), the right to bear arms in McDonald v. Chicago (2010), and protection against self-incrimination in Malloy v. Hogan (1964). Judicial review is the mechanism the Court now uses to enforce those incorporated rights against states.
Set the Binding Interpretation of the Constitution
Many constitutional phrases are broad by design. “Due process of law,” “equal protection,” “unreasonable searches” — each requires interpretation before it can be applied to a real dispute. The Supreme Court fills that role, and when it decides what a clause requires in a specific context, that interpretation binds every federal and state court in the country.
Once the Court issues a constitutional interpretation, stare decisis gives that ruling lasting force. Lower courts must apply it, and the Court itself generally follows its own prior rulings so people and governments can plan their conduct around settled meaning. Stare decisis is not absolute. The Court can and does overrule itself when it concludes a prior decision was badly reasoned or has become unworkable, as it did in Loper Bright. The party asking for a reversal carries a heavy burden, and the Court weighs factors like whether people have built their lives around the existing rule.
What Judicial Review Cannot Do
The Court cannot announce on its own that a law is unconstitutional. Several structural limits shape when and how the power can be used.
A Real Case Must Come First
Article III limits the federal judiciary to deciding actual “cases” and “controversies.”8Cornell Law Institute. U.S. Constitution Article III The Court cannot issue advisory opinions or answer hypothetical questions. Someone with a real, concrete injury must sue, and the parties must have genuinely opposing legal interests. A dispute that has already been resolved (moot) or that hasn’t caused any harm yet (unripe) falls outside the Court’s jurisdiction.9Constitution Annotated. Overview of Cases or Controversies
Some Questions Belong to Other Branches
Certain constitutional questions belong to Congress or the President, not the courts. The Court recognized this in Baker v. Carr, 369 U.S. 186 (1962), which identified factors that make an issue a non-justiciable “political question,” including situations where the Constitution clearly assigns the decision to another branch or where no manageable legal standard exists for a court to apply.10Justia. Baker v. Carr, 369 U.S. 186 Foreign affairs decisions and the impeachment process are classic examples of areas where courts have declined to intervene.11Constitution Annotated. Overview of Political Question Doctrine
The Court Picks Its Cases
Parties who lose in a lower court must petition for a writ of certiorari, and four of the nine justices must vote to accept the case. The Court currently accepts roughly 100 to 150 cases out of the thousands of petitions it receives each term.12United States Courts. Supreme Court Procedures A law the Court declines to review stays in effect, even if reasonable arguments exist that it’s unconstitutional.
Congress also holds some control over the Court’s docket. Article III gives Congress the power to make “exceptions” and “regulations” governing the Court’s appellate jurisdiction.13Constitution Annotated. Supreme Court Appellate Jurisdiction Congress has used that authority to shift the Court from mandatory appeals to the discretionary certiorari system in place today. The outer limits of the power remain debated, but it is a reminder that judicial review itself operates inside a system of checks.