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Approval rating falls; Republicans win Congress in 1946

The president's approval rating dropped from 82 percent in the polls in January 1946 to 52 percent by June. This dissatisfaction led to large Democratic losses in the 1946 midterm elections, and Republicans took control of Congress for the first time since 1930. When Truman dropped to 32 percent in the polls, Democratic Arkansas Senator William Fulbright suggested that Truman resign; the president said he did not care what Senator "Halfbright" said.

Truman cooperated closely with the Republican leaders on foreign policy but fought them bitterly on domestic issues. The power of the labor unions was significantly curtailed by the Taft–Hartley Act which was enacted over Truman's veto. Truman twice vetoed bills to lower income tax rates in 1947. Although the initial vetoes were sustained, Congress overrode his veto of a tax cut bill in 1948. In one notable instance of bipartisanship, Congress passed the Presidential Succession Act of 1947, which replaced the secretary of state with the Speaker of the House and the president pro tempore of the Senate as successor to the president after the vice president.