Truman made four appointments to the United States Supreme Court. After the retirement of Owen Roberts in 1945, Truman appointed Republican Senator Harold Hitz Burton of Ohio to the Supreme Court. Truman made four appointments to the United States Supreme Court. After the retirement of Owen Roberts in 1945, Truman appointed Republican Senator Harold Hitz Burton of Ohio to the Supreme Court. In addition to his Supreme Court appointments, Truman also appointed 27 judges to the courts of appeals and 101 judges to federal district courts. Justices, Presidents, and Senators: A History of the U.S. Supreme Court Appointments from Washington to Clinton. Rowman & Littlefield. pp.