On October 10, 1973, Vice President Spiro Agnew (a Republican) was forced to resign following a controversy over his personal taxes. Under the terms of the 25th Amendment, a vice presidential vacancy is filled when the president nominates a candidate who is confirmed by both houses of Congress. President Richard Nixon (a Republican) thus had the task of selecting a vice president who could receive the majority support of both houses of Congress, which were then controlled by the Democrats.