President Joe Biden and Speaker Kevin McCarthy’s debt deal should have made this fall’s incoming funding fight easier. Instead, the opposite has happened.

Congressional spending leaders who — in theory — could have used the spending cuts outlined in the bipartisan debt agreement now find themselves in a more onerous position as various factions on the Hill push to shirk the terms of the Biden-McCarthy deal. And senior lawmakers have only a narrow window to write a dozen spending bills that can pass both chambers, facing a tight time crunch less than four months before government funding runs out.

Several different groups of lawmakers are trying to revisit the debt deal’s funding caps. House conservatives, accusing McCarthy of backtracking on secret promises and cutting a bum deal with Biden, shut down the floor last week as they made the case for steeper slashes than the duo agreed to. Senate Republicans are searching for a way around the budget caps as well, to add cash for the Pentagon and Ukraine. And Democrats are looking for ways to ensure that priorities like disaster aid and immigration programs don’t get short shrift.

The conservative rebellion and competing calls for more cash only compound fears of a dicey finale to this fall’s spending fight. As the threat of a government shutdown looms at the end of September, some lawmakers are avoiding any predictions after Congress managed to pass the debt limit package before a catastrophic U.S. default.

“Who knows what’s gonna happen? I mean, Jesus,” said Sen. Jon Tester (D-Mont.), the top Democrat who oversees defense spending. “We should celebrate that we actually didn’t shoot ourselves in the head.”

Tester is clamoring to start working with his Republican counterpart, Maine Sen. Susan Collins, to divvy up the largest pot of annual cash: the defense funding bill, which is expected to total more than $800 billion.

“I’ve got a tremendous amount of respect for Susan. We’ll work together. We’re gonna figure it out,” Tester said.

Collins, also the Senate’s leading Republican appropriator, and Senate GOP Leader Mitch McConnell (R-Ky.) have both aired hopes that Congress can exceed the $886 billion defense cap outlined in the debt limit package. Those two, and plenty of other senators, want Congress to pass a supplemental spending bill that would pour additional cash into efforts to head off Russian and Chinese aggression.

But their call for more money puts them at odds with McCarthy, who has questioned the need for a supplemental package that would undercut the House’s GOP’s original goal of cutting spending.

Sen. Susan Collins (R-Maine) has aired hopes that Congress can exceed the $886 billion defense cap outlined in the debt limit package.