House Republicans abruptly postponed plans to take up a revised budget proposal Tuesday evening, as leaders struggled to round up conservative votes — throwing into question what the next step would be as lawmakers try to make a Thursday deadline to raise the debt ceiling.

House GOP leaders are now meeting to consider the next move.

While the Senate had originally been crafting a bipartisan bill to address the budget impasse, House Republicans surprised Senate negotiators earlier Tuesday when they announced they were pursuing their own framework. Moving quickly, House Speaker John Boehner’s office announced late Tuesday afternoon that the chamber would vote by the end of the night.

But a vital meeting of the House Rules Committee, which prepares bills for the floor, was then postponed — a signal that House leaders were lacking the necessary votes.