Senate Republicans blocked a bill Friday that would restrict the interrogation methods the CIA can use against terrorism suspects.

The bill would require the CIA to adhere to the Army's field manual on interrogation, which bans waterboarding, mock executions and other harsh interrogation methods.

The interrogation procedure, which is recognized as a form of torture by making the subject think he's drowning, is banned by international law. It has been used by CIA interrogators on terrorism suspects, or by those to whom U.S. prisoners have been sent via rendition flights.

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