Congressional frustration with the prolonged war in Vietnam leads to passage of the War Powers Resolution on Nov. 7, 1973, over President Richard Nixon’s veto. The resolution requires presidents to notify Congress within 48 hours of committing U.S. combat troops abroad, and establishes a 60-day limit on the deployment of troops in combat overseas without congressional approval. The resolution remains controversial, with varying arguments over its effect on the power of Congress, as well as that of the president.