A revised Senate resolution criticizing President Bush’s troop buildup in Iraq, offered by Senator John Warner, Republican of Virginia, drew new support today as two of the authors of a sterner resolution of disapproval said they would accept the Warner compromise.

Senators Joseph Biden, Democrat of Delaware, and Chuck Hagel, Republican of Nebraska, said they would back Mr. Warner’s new wording, which among other changes removed language that Democrats saw as creating a potential loophole.


“The bottom line of our resolutions is the same: Mr. President, don’t send more Americans into the middle of civil war,” said Mr. Biden, one of the authors of the resolution that was approved last week by the Foreign Relations Committee, which he chairs.


Senator Carl Levin, Democrat of Michigan and chairman of the Armed Services Committee, was the third author of that plan; on Wednesday night he had agreed to support Mr. Warner, the ranking Republican on that committee.


The Democratic leadership of the Senate now intends to use Mr. Warner’s proposal, co-sponsored by Senators Susan Collins, Republican of Maine, and Ben Nelson, Democrat of Nebraska, as the basis for the debate that will unfold next week, though Republicans could still raise procedural obstacles.


The Senate Republican leadership intends to mount vigorous resistance to any plan that rejects Mr. Bush’s troop buildup and has concentrated in recent days on trying to prevent Republicans from joining Mr. Warner.
Backers of the new Warner resolution will likely need to attract at least a dozen Republicans to reach the 60-vote total required to overcome a filibuster or other procedural obstacles. Six Republicans have so far voiced their support.


And some Democrats are possible opponents, arguing that the measure does not go far enough in blocking Mr. Bush’s initiative, meaning even more members of Mr. Bush’s party might have to be persuaded to sign on.