The most famous power the Supreme Court has is the power to strike down a law. Go and read the Constitution: it is not in there. Here is how the Court got it anyway.
Nine people, none of them elected, can look at something Congress passed and the president signed, and cancel it.
That is an enormous power, and everybody knows the Court has it. So the natural assumption is that somebody wrote it down.
Article III is the part of the Constitution about the courts. It is the shortest of the three branch articles — under a thousand words. It sets up one Supreme Court, lets Congress create the lower courts, lists the kinds of cases federal courts may hear, and defines treason. It does not say the Court may strike down a law. Neither does any other article, and neither does any amendment.
So where did the power come from?
In 1801 a man named William Marbury was appointed a justice of the peace in the District of Columbia. The paperwork was signed but never delivered before the administration changed hands, and the new secretary of state — James Madison — would not hand it over.
Marbury sued to get his job. He asked the Supreme Court for an order forcing Madison to deliver the commission, using a route Congress had written into the Judiciary Act of 1789.
On February 24, 1803, Chief Justice John Marshall delivered the decision. Marbury lost. And that is the part that makes the case famous, because of the reasoning Marshall used to make him lose.
Marshall's opinion is a chain, and the order matters more than any single link. Press through it one move at a time and watch where it ends up.
Judicial review is not a grant in the Constitution. It is a conclusion a court reached about what the Constitution means, in 1803, and it held because it was never successfully challenged.
Marbury asked the Supreme Court for an order and the Court refused to give him one. What did the Court say was the obstacle?
Two more things everyone assumes are in the Constitution, and are not.
Nine is not constitutional. Article III says there shall be a Supreme Court and leaves the size to Congress, which has set it six times:
"Lifetime appointment" is an inference. The actual words in Article III are that judges hold their offices during good Behaviour. No term, no retirement age, no renewal. In practice that means until they resign, retire or die — or, in principle, until Congress removes them by impeachment, which has happened to a Supreme Court justice exactly once, in 1804, and the Senate acquitted him.
That design is deliberate. A judge who never faces re-election never has to worry about whether a ruling will be popular. The trade is exactly what you would expect: the same insulation that lets a judge rule against a president also means the public has no direct way to remove one who they think is doing it badly. The longest anyone has served is 36 years — William Douglas, from 1939 to 1975.
The branch that can cancel a law sounds unstoppable. It is heavily constrained, and almost none of the constraints are the ones people guess. Sort each of these and read why.
Tap an item, then tap where it belongs
A law is passed that the justices privately think plainly conflicts with the Constitution. Nobody sues over it. What happens?
If Congress can set the number of justices with an ordinary law, an obvious thought follows: a president unhappy with the Court could ask Congress for more seats and fill them.
In February 1937 President Franklin Roosevelt did exactly that. His bill would have let the president appoint an additional justice for every sitting justice over the age of seventy, up to six more — which would have taken the Court to fifteen. Roosevelt had just been re-elected in a landslide, and his party held very large majorities in both chambers.
It failed. The Senate Judiciary Committee sent the bill to the floor with a report recommending against it, calling it an invasion of judicial power that had never before been attempted in the country. On July 22, 1937 the Senate voted 70 to 20 to send the bill back to committee, which finished it.
The part worth carrying: the Senate that stopped it was controlled by the president's own party. This was not one party blocking another. It was a chamber deciding that a thing it clearly had the legal power to do was a thing it would not do — and the number has not moved since 1869.
Whether that restraint was wisdom or a missed opportunity is argued about to this day, and the argument runs in both directions inside both parties. What is not argued about is the vote count.
One more thing belongs here, because an episode that only showed judicial review working well would be selling you something.
The first time the Supreme Court struck down an act of Congress was Marbury, in 1803. The second time was 1857, in Dred Scott v. Sandford, where the Court held that the Missouri Compromise was unconstitutional and that Black Americans could not be citizens. Fifty-four years passed between the first use of the power and the second, and the second is now near-universally regarded as the worst decision the Court has ever issued.
It took a civil war and the 13th and 14th Amendments to undo it.
So the honest summary of judicial review is not that it is a safety net. It is a power that has been used to strike down laws people are glad are gone and laws people wish had stayed, held by nine unelected people who cannot be voted out. The people who designed the insulation knew exactly what they were trading for it, and whether the trade was a good one is a real argument that serious people have been having since 1803.
Congress could add justices to the Supreme Court by passing an ordinary law. So what actually stopped it in 1937?
You’re previewing as a parent — nothing here is recorded.
Article III of the Constitution establishes one Supreme Court, leaves its size and the creation of lower courts to Congress, extends the judicial power to 'Cases' and 'Controversies', and provides that judges 'shall hold their Offices during good Behaviour'. It does not grant the power to declare laws unconstitutional (Constitution Annotated, congress.gov). Marbury v. Madison, 5 U.S. (1 Cranch) 137, decided February 24, 1803: the first case in which the Supreme Court invalidated an act of Congress, holding Section 13 of the Judiciary Act of 1789 unconstitutional insofar as it enlarged the Court's original jurisdiction beyond what Article III permits (Justia; Federal Judicial Center; Library of Congress research guide). The Court declined President Washington's 1793 request for answers to legal questions, establishing that federal courts do not issue advisory opinions and act only in a live case or controversy (Federal Judicial Center; Constitution Annotated). Size of the Supreme Court set by Congress: six by the Judiciary Act of 1789; seven in 1807; nine in 1837; ten in 1863; reduced to seven by the Judicial Circuits Act of 1866; restored to nine by the Judiciary Act of 1869, the last change (Federal Judicial Center, 'Landmark Legislation'; Supreme Court Historical Society). Samuel Chase, impeached by the House in 1804, is the only Supreme Court justice ever impeached; the Senate acquitted him in 1805 (U.S. Senate, 'The Impeachment of Samuel Chase'). William O. Douglas served 36 years and 209 days, from April 17, 1939 to November 12, 1975 — the longest tenure of any justice (Supreme Court Historical Society). Dred Scott v. Sandford, 60 U.S. 393, decided March 6, 1857: the second case in which the Supreme Court held an act of Congress unconstitutional, striking the Missouri Compromise of 1820 and holding that Black Americans could not be citizens. Its holdings were overturned by the 13th and 14th Amendments (Britannica; Library of Congress). Judicial Procedures Reform Bill of 1937: introduced February 5, 1937, it would have allowed an additional justice for each sitting justice over 70, up to six. The Senate Judiciary Committee reported adversely, describing it as an invasion of judicial power never before attempted. On July 22, 1937 the Senate voted 70-20 to recommit the bill, ending it. Democrats held large majorities in both chambers at the time (U.S. Senate historical records; Time; Bill of Rights Institute). Amending the Constitution requires two-thirds of both chambers of Congress and ratification by three-quarters of the states (Article V).