The Senate is going down to the wire ahead of an expected mid-Thursday vote on a two-year budget and debt ceiling deal.

Senators are expected to start holding votes related to the agreement by 11:30 a.m., with a final vote on the budget deal happening around noon. The agreement will need 60 votes to pass the Senate.

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While leadership has been confident they will be able to wrangle together a bipartisan coalition to send the agreement to President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s desk, the vote could be close, with Republicans indicating as late as Wednesday that they were still working to build support within their caucus.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) made a final pitch for the agreement on Thursday morning, arguing that it was the best outcome and only game in town with the House already gone for the August recess.

“We knew any bipartisan agreement on funding levels would not appear perfect to either side. But the administration negotiated a strong deal,” McConnell said. “The bipartisan funding deal is the opportunity on the table to continue filling these gaps before it’s too late.”

But members of GOP leadership have stopped short of pledging they’ll be able to put up a majority of their 53-member caucus to support the deal, which would lift spending caps and suspend the debt ceiling through mid-2021.

Sen. John Thune John Randolph ThuneSenate passes resolution reaffirming commitment to peaceful transition of power Susan Collins faces political land mine with Supreme Court fight Abortion stirs GOP tensions in Supreme Court fight MORE (R-S.D.) acknowledged that debt ceiling and spending votes were difficult for Republicans, who would prefer to offset the new spending with cuts or revenue raisers to help pay for the agreement.

"We're continuing to work our members and we're hoping we're going to have a good strong showing," Thune said when asked if half of Republicans would support the deal.

Senate Appropriations Committee Chairman Richard Shelby Richard Craig ShelbySenate to push funding bill vote up against shutdown deadline Senate GOP eyes early exit Dems discussing government funding bill into February MORE (R-Ala.), asked if it would be embarrassing if a majority of Republicans opposed the deal, said, “As long as we win it won't be embarrassing."

"If they fail to pass that bill, it would be a huge setback for everybody," he added.

Though Trump has endorsed the deal, conservatives and fiscal hawks have balked because of the hike in nondefense spending and lack of broader offsets for the agreement.

At least 13 Republican senators have announced they will vote against the deal, but that number is expected to climb ahead of the vote. An additional five senators opposed the 2018 budget deal but haven’t said how they’ll vote on Thursday’s agreement. Other GOP senators, including Sen. Tim Scott Timothy (Tim) Eugene ScottAuthor Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' Now is the time to renew our focus on students and their futures GOP lobbyists pleasantly surprised by Republican convention MORE (R-S.C.), are still weighing how to vote.

The Senate had been expected to vote on the budget agreement on Wednesday.

Sen. Roy Blunt Roy Dean BluntSenate to push funding bill vote up against shutdown deadline Social media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Mo.) a member of leadership, floated that one reason it might have been delayed until Thursday was because Republicans were working to “maximize the vote.”

Most Democrats are expected to support the deal, though White House hopefuls and progressives are likely to vote against it. Twelve opposed the 2018 budget deal.

The GOP hand wringing over the budget vote has sparked days of chatter within the Capitol about how many Republicans will ultimately oppose Trump’s deal.

Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) walked by a group of reporters who were waiting outside a GOP meeting on Wednesday. Deepening his voice, in an apparent attempt to mimic McConnell, he said, "Well, we had a very good meeting but we don’t have enough votes to get the budget bill through.”