President Bush signed legislation Tuesday authorizing tough interrogation of terror suspects and smoothing the way for trials before military commissions, calling it a "vital tool" in the war against terrorism.

Bush's plan for treatment of the terror suspects became law just six weeks after he acknowledged that the CIA had been secretly interrogating suspected terrorists overseas and pressed Congress to quickly give authority to try them in military commissions.

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The American Civil Liberties Union said the new law is "one of the worst civil liberties measures ever enacted in American history."

"The president can now, with the approval of Congress, indefinitely hold people without charge, take away protections against horrific abuse, put people on trial based on hearsay evidence, authorize trials that can sentence people to death based on testimony literally beaten out of witnesses, and slam shut the courthouse door for habeas petitions," said ACLU Executive Director Anthony D. Romero.

"Nothing could be further from the American values we all hold in our hearts than the Military Commissions Act," he said.

The swift implementation of the law is a rare bit of good news for Bush as casualties mount in Iraq in daily violence.