Sen. John McCain said 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."
Two amendments to the resolution, co-sponsored by McCain and Sen. Chris Coons (D-Del.), passed the foreign relations committee by voice vote Wednesday afternoon. The changes ask to modify two of its sections, said a press release from McCain's office.
Sen. John Barrasso (R-Wyo.) said the Senate Foreign Relations Committee may not vote Wednesday on a decision for Obama's proposal amid news of McCain's opposition to the new version of the resolution.
On Tuesday, the committee's leaders drafted a resolution that would permit Obama to order a "limited and tailored" military mission against Syria, as long as it doesn't exceed 90 days and involves no American troops on the ground for combat operations.