Republican leaders muscled through resistance in their own ranks to approve the budget blueprint for the war and other measures, but its prospects were far dimmer in the Senate.
Republicans managed to push through legislation to fund the government through Dec. 4. But with Democrats opposed, the stage is set for a broader battle.
A House panel approved the measure. But Republicans are divided over its size, cost and policy provisions, and many are concerned about the timing before the midterm elections.
Senator John Thune of South Dakota, the majority leader, openly questioned whether “the juice” was “worth the squeeze,” given the deep divisions in his conference over the measure.
The plan faces a rocky path amid Republican divisions and would pave the way for votes months before the midterm elections to fund a war that polls show is deeply unpopular.