<P> On December 10, 1974, Rockefeller was confirmed 90--7 by the Senate . On December 19, 1974, Rockefeller was confirmed 287--128 by the House and sworn into office later that day in the Senate chamber . </P> <P> On July 12, 1985, President Ronald Reagan underwent a colonoscopy, during which a villous adenoma (a pre-cancerous lesion) was discovered . When told by his physician (Dr. Edward Cattau) that he could undergo surgery immediately or in two to three weeks, Reagan elected to have it removed immediately . </P> <P> That afternoon, Reagan consulted with White House counsel Fred Fielding by telephone, debating whether to invoke the amendment and, if so, whether such a transfer would set an undesirable precedent . Fielding and White House Chief of Staff Donald Regan recommended that Reagan transfer power and two letters doing so were drafted: the first letter specifically invoked Section 3 of the Twenty - fifth Amendment; the second only mentioned that Reagan was mindful of this provision . At 10: 32 a.m. on July 13, Reagan signed the second letter and ordered its delivery to the appropriate officers as required under the amendment . Vice President George H.W. Bush was Acting President from 11: 28 a.m. until 7: 22 p.m., when Reagan transmitted a second letter to resume the powers and duties of the office . </P> <P> Books such as The President Has Been Shot: Confusion, Disability and the 25th Amendment, by Herbert Abrams, and Reagan's autobiography, An American Life, argue President Reagan's intent to transfer power to Vice President Bush was clear . Fielding himself adds: </P>

Who was the president the first time the disability provisions of the 25th amendment came into play
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