The measure has already helped topple the top House GOP leader and exacerbated painful divisions between more pragmatic Republicans and the tea party wing that is increasingly dominant, especially in the rough-and-tumble House.
Tea party forces are frustrated that the measure, which would prevent a repeat of the partial shutdown of the government two years ago, fails to take away federal funding that goes to Planned Parenthood.
The Senate and then the House are scheduled to vote on the measure on Wednesday. It would provide 10 weeks of time to negotiate a budget deal for the rest of fiscal 2016.
