 Reaction in the U.S. Congress to the incursion was also swift . Senators Frank F. Church ( Democratic Party , Idaho ) and John S. Cooper ( Republican Party , Kentucky ) , proposed an amendment to the Foreign Military Sales Act that would have cut off funding not only for U.S. ground operations and advisors in Cambodia , but would also have ended U.S. air support for Cambodian forces . On 30 June the United States Senate passed the act with the amendment included . The bill was defeated in the House of Representatives after U.S. forces were withdrawn from Cambodia as scheduled . The newly amended act did , however , rescind the Southeast Asia Resolution ( better known as the Gulf of <unk> Resolution ) under which Presidents Johnson and Nixon had conducted military operations for seven years without a declaration of war . 
