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Marbury v. Madison, legal case in which, on February 24, 1803, the U.S. Supreme Court first declared an act of Congress unconstitutional, thus establishing the doctrine of judicial review. The court’s opinion, written by Chief Justice John Marshall, is considered one of the foundations of U.S. constitutional law. Background In the weeks before Thomas Jefferson’s inauguration as president in March 1801, the lame-duck Federalist Congress created 16 new circuit judgeships (in the Judiciary Act of 1801) and an unspecified number of new judgeships (in the Organic Act), which Adams proceeded to fill with Federalists in an effort to preserve his party’s control of the judiciary and to frustrate the legislative agenda of Jefferson and his Republican (Democratic-Republican) Party. Because he was among the last of those appointments (the so-called “midnight appointments”), William Marbury, a Federalist Party leader from Maryland, did not receive his commission before Jefferson became president. Once in office, Jefferson directed his secretary of state, James Madison, to withhold the commission, and Marbury petitioned the Supreme Court to issue a writ of mandamus to compel Madison to act.