Bush vetoed a bill that would have explicitly prohibited the agency from using such interrogation methods, which include waterboarding, a technique in which restrained prisoners are threatened with drowning and that has been the subject of intense criticism at home and abroad.

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The Senate's majority leader, Harry Reid of Nevada, said that Mr. Bush disregarded the advice of military commanders, including Gen. David H. Petraeus, who argued that the military's interrogation techniques were effective and that the use of any others could create risks for any future American prisoners of war.

"He has rejected the Army field manual's recognition that such horrific tactics elicit unreliable information, put U.S. troops at risk and undermine our counterinsurgency efforts," Mr. Reid said in a statement.