Sen. John McCain (R-Ariz.) said Wednesday that he opposes the Syria use-of-force resolution as crafted by the Senate Foreign Relations Committee.
McCain has pushed for more active military involvement, but is concerned senators have sought to lessen the president's authority in the language used in the resolution.
"In its current form, I do not" support it, McCain told AP.
McCain's departure demonstrates the fine line members are walking in crafting the resolution. Most opponents of the resolution would prefer no military action at all. McCain and Sen. Lindsey Graham (R-S.C.) have suggested they may oppose the resolution if it's too weak.
The Senate resolution was crafted after the Senate Foreign Relations Committee on Tuesday held a hearing featuring Secretary of State John Kerry, Defense Secretary Chuck Hagel and Joint Chiefs of Staff Chairman Gen. Martin Dempsey.
The resolution is being marked up Wednesday in the committee, so McCain's opposition may not be final.