The vote to declassify the 6,300-page review's summary was 11-3. The "torture report" argues CIA methods were often cruel and ineffective. The agency disputes the findings.
The two sides are embroiled in a bitter dispute.
Senators accuse the agency of spying on their investigation and deleting files. The CIA says Senate staffers illegally accessed information. The Justice Department is reviewing competing criminal referrals.
President Barack Obama supports releasing the report.
Spokesman Jay Carney says the president will instruct intelligence agencies to conduct declassification work quickly.
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