Republican presidential candidate John McCain said President Bush should veto a measure that would bar the CIA from using waterboarding and other harsh interrogation methods on terror suspects.

McCain voted against the bill, which would restrict the CIA to using only the 19 interrogation techniques listed in the Army field manual.

His vote was controversial because the manual prohibits waterboarding -- a simulated drowning technique that McCain also opposes -- yet McCain doesn't want the CIA bound by the manual and its prohibitions.

McCain spokeswoman Jill Hazelbaker noted that McCain believes that waterboarding is already banned by the Detainee Treatment Act of 2005, which includes an amendment he wrote barring inhumane treatment of prisoners. The act prohibited cruel, inhuman and degrading treatment for all detainees in U.S. custody, including CIA prisoners.