After Vice President Spiro Agnew resigned from his office, Gerald Ford became the new vice president because of Section 2 of the 25th Amendment. This section allows the president to nominate a new vice president to be approved by Congress.
The Twenty-fifth Amendment to the United States Constitution addresses issues related to presidential succession and disability.
"Whenever there is a vacancy in the office of the Vice President, the President shall nominate a Vice President who shall take office upon confirmation by a majority vote of both Houses of Congress."