Page "Acting President of the United States" Paragraph 64

Precedent confirms that, since, in the three occasions when the 25th Amendment was invoked, there is no record of the Vice President having taken the oath.

In the case of the Amendment's second invocation by President George W. Bush in 2002, a detailed account of the procedure was subsequently given by the White House Press Secretary, and no mention whatsoever was made of the oath being taken by the Vice President.

Instead, it is recorded that Vice President Cheney was informed by telephone that he was now acting president as soon as the invocation letters signed by the President were transmitted to the Speaker of the House and the President pro tempore of the Senate.

Likewise, there is no historical record of Vice President George H. W. Bush taking the oath when he filled in for President Ronald Reagan during the latter's prostate surgery nor of Cheney taking the oath the second time he assumed George W. Bush's presidential duties.