"We must not abandon our mission, but we must begin a transition where the Iraqi government and its neighbors play a larger role in stabilizing Iraq," Sen. George Voinovich, R-Ohio, wrote in a letter to Bush.

Voinovich, a member of the Senate Foreign Relations Committee, released his letter Tuesday - one day after Sen. Richard Lugar of Indiana, the panel's top Republican, said in a floor speech that Bush's strategy was not working.

"The longer we delay the planning for a redeployment, the less likely it is to be successful," said Lugar, who plans to meet later this week with Stephen Hadley, Bush's national security adviser.

Lugar and Voinovich are not the first GOP members to call for U.S. troops to leave Iraq. Sens. Chuck Hagel of Nebraska, Olympia Snowe of Maine and Gordon Smith of Oregon made similar remarks earlier this year. But their public break is significant because it raises the possibility that Senate Democrats could muster the 60 votes needed to pass legislation that would call for Bush to bring troops home.

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