Sen. John McCain says he doesn't support the latest Senate resolution to authorize military force against Syria.
McCain is an outspoken advocate of intervention against Syrian President Bashar Assad's regime and wants more than cruise missile strikes and other limited action.
The Arizona Republican threatened earlier this week to vote against a White House draft resolution unless President Barack Obama promised greater support to Syria's rebels. McCain then expressed support after meeting Obama at the White House.
He now opposes a resolution crafted by Democratic Sen. Bob Menendez of New Jersey and Republican Sen. Bob Corker of Tennessee. It puts a 90-day limit on action and says no American troops can be sent into Syria.
Asked if he supported it, McCain said, "In its current form, I do not."
The decision is a setback for the administration's effort to win swift support from Congress for an attack. McCain's opposition is likely a negotiating tactic to win more aggressive language in the resolution.
But it's unclear how far the rest of the Senate Foreign Relations Committee will go, with some members worried the resolution goes too far. A vote on the committee level was expected as early as Wednesday.
Sen. John Barrasso, R-Wyo., though, said the committee might delay the vote on the heel's of McCain's comments.
The Senate Foreign Relations Committee could vote on authorizing the use of force as early as Wednesday afternoon, the first in a series of votes as the president's request makes its way through Senate and House committees before coming before the two chambers for a final vote.
Separately, the House Foreign Affairs Committee is holding a hearing on Wednesday, which could be more contentious than the hearing held a day earlier on the Senate side.
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