WASHINGTON (AP) — Former Secretary of State Colin Powell endorsed efforts to block President Bush’s plan to authorize harsh interrogations of terror suspects, even as Bush lobbied personally for it Thursday on Capitol Hill.

The latest sign of GOP division over White House security policy came in a letter that Powell sent to Sen. John McCain, R-Ariz., one of three rebellious senators taking on the White House. Powell said Congress must not pass Bush’s proposal to redefine U.S. compliance with the Geneva Conventions, a treaty that sets international standards for the treatment of prisoners of war.

This development accompanied Bush’s visit to Capitol Hill, where he conferred behind closed doors with House Republicans. His plan would narrow the U.S. legal interpretation of the Geneva Conventions treaty in a bid to allow tougher interrogations and shield U.S. personnel from being prosecuted for war crimes.

“The world is beginning to doubt the moral basis of our fight against terrorism,” said Powell, who served under Bush and is a former chairman of the Joint Chiefs of Staff. “To redefine Common Article 3 would add to those doubts. Furthermore, it would put our own troops at risk.”

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Smear him too, Rove! Bring it!