Vice President of the United States the Twenty-fifth Amendment established a procedure for filling such a vacancy: This procedure has been implemented twice since the amendment came into force. The first instance occurred in 1973 following the October 10 resignation of Spiro Agnew, when Gerald Ford was nominated by President Richard Nixon and confirmed by Congress. The second occurred 10 months later following Ford's August 9, 1974 accession to the presidency upon Nixon's resignation, when Nelson Rockefeller was nominated by President Ford and confirmed by Congress. Had it not been for this new constitutional mechanism, the vice presidency would have remained vacant after Agnew's resignation and
Vice President of the United States H. W. Bush. In January 1961, it fell to Richard Nixon to preside over this process, and to announce the election of his 1960 opponent, John F. Kennedy. John C. Breckinridge, in 1861, and Al Gore, in 2001, have also had to announce their opponent's election. In 1969, Vice President Hubert Humphrey would have done so as well, following his 1968 loss to Richard Nixon; however, on the date of the Congressional joint session, Humphrey was in Norway attending the funeral of Trygve Lie, the first elected Secretary-General of the United Nations. The president pro tempore presided in his absence.