Senators have been scrambling to find a consensus on a massive bipartisan infrastructure bill, which is a key element that will face vote today, according to USA Today.

Republicans, however, have warned the vote could fail if rushed, as senators haggle over details on transit and how to pay for the entire package. Several Republican negotiators have said they’ll vote against beginning the debate Wednesday, potentially postponing Democratic hopes to move the bill closer to passage.

Republican negotiators have urged Senate Majority Leader Chuck Schumer, D-N.Y., to wait until Monday to begin debating the bill so they have legislative language and a score of how much it will cost.

But after talks ran to 11 p.m. Tuesday, the latest in a series of late-night talks, Democrats were optimistic that a deal could be reached Wednesday morning before the vote and legislative language drafted afterward.

“I really believe, tomorrow it will be done,” Sen. Jon Tester, D-Mont., said late Tuesday. “We are so close.”

A series of calls are scheduled Wednesday morning to complete negotiations, which could be wrapped up by noon, he said.

The vote is scheduled about 3 p.m.

The vote on whether to begin debating the package requires 60 out of 100 senators to overcome a potential filibuster from opponents. Democrats need at least 10 Republicans to join them, to succeed.