 Truman cooperated closely with the Republican leaders on foreign policy, though he 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. The parties did cooperate on some issues; Congress passed the Presidential Succession Act of 1947, making the Speaker of the House rather than the Secretary of State next in line to the presidency after the vice president.
