The Senate’s immigration debate is hitting a wall before it even gets started.

Democrats blocked Republicans from setting up votes on Tuesday, while GOP senators themselves outlined different approaches for how to build a compromise that could get 60 votes — the supermajority required to overcome a filibuster and clear legislation from the Senate.

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Conservatives are trying to draw a hard line on the White House framework as the only game in town that President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE will sign.

“The president’s framework is not an opening bid in negotiations. It is a best and final offer,” Sen. Tom Cotton Tom Bryant CottonRenewed focus on Trump's Supreme Court list after Ginsburg's death Republicans call for DOJ to prosecute Netflix executives for releasing 'Cuties' Loeffler calls for hearing in wake of Netflix's 'Cuties' MORE (R-Ark.) told reporters.

The proposal would provide a path to citizenship for 1.8 million immigrants brought into the country illegally as children in exchange for $25 billion in border security, as well as more controversial changes to legal immigration and interior enforcement.

Supporters argue it represents a significant concession from Trump, who backed deporting the roughly 11 million immigrants currently in the country illegally as part of his presidential bid.

There are doubts, however, that it could get enough support from Democrats to reach 60 votes. No Democrat has come out to support the bill, though Cotton thinks centrists could be pulled over.

And while the Trump proposal has the support of GOP leaders, the caucus is not united.

Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeRepublican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style Bush endorsing Biden? Don't hold your breath MORE (R-Ariz.) said that while it had “informed the discussion,” senators needed to work out the endgame amongst themselves.

“I think this is a Senate product. He has his framework already out there. That’s informed the discussion, but we need to work this out ourselves,” he said.

With the floor debate largely at a standstill, rank-and-file Republicans are drafting a range of alternatives.

These include a years-long patch to the Obama-era Deferred Action for Childhood Arrivals (DACA) program that Trump is unwinding and broader bills that would address each of the “four pillars” agreed to during a bipartisan meeting with Trump last month.

“We’re beginning to refine whether or not it’s a two-pillar bill or a four-pillar bill, and what are the combinations that would allow it to be four pillar,” said Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.C.).

Republicans are under pressure from the party’s base to take a hard stance in the negotiations, and Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE (R-Ky.) is stressing that a bill must be able to pass the House and win the support of Trump.

NumbersUSA is urging its members to call senators and tell them to oppose any bill that doesn’t fulfill “Trump’s promises,” including ending the State Department’s diversity visa lottery program and “chain,” or family-based, immigration.

Sen. Roy Blunt Roy Dean BluntCDC tells Congress it urgently needs billion for vaccine distribution On The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package MORE (R-Mo.) said a final agreement could still emerge but questioned whether any legislation could win 60 Senate votes and also pass the House.

“I think it’s going to be interesting to see how the debate develops, and I’m not sure the plan is on the table yet that’s the plan that finally passes,” he said.

A bipartisan group of roughly 20 senators, led by Sen. Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Maine), are searching for a compromise the might be backed by centrists in both parties.

“We’re continuing to have discussions. ... I think we’re making progress, but we’re not there yet. This is a very complex issue, and you pull one thread and unravel a whole other part of the tapestry,” Collins said.

The group had largely been focused on trying to find an agreement that could serve as the starting point of the Senate’s debate, with multiple members of the group floating a narrower deal that focused on a fix for DACA and border security.

But Sen. Mike Rounds Marion (Mike) Michael RoundsChamber of Commerce endorses McSally for reelection Senate GOP eyes early exit Senate Republicans signal openness to working with Biden MORE (R-S.D.) said a subgroup of the coalition is working on a broader proposal that would also deal with changes to family-based immigration and the diversity visa lottery.

“It’s a drafting group that we want to present to the full group,” he said, adding that there could be “several drafting groups.”

Flake is preparing two measures: a three-year DACA and border security patch and a broader measure that would provide a path to citizenship for some DACA recipients in exchange for $25 billion in border security and changes to legal immigration.

Graham and Sen. Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (D-Ill.) both indicated on Tuesday that they haven’t made a final decision about whether to try to get a vote on their Gang of Six bill that has been repeatedly shot down by Trump and the White House.

Meanwhile, Sen. Christopher Coons Christopher (Chris) Andrew CoonsBiden promises Democratic senators help in battleground states Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Del.) said he is planning offer his plan with Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE (R-Ariz.), who is battling brain cancer. But Republicans predicted that bill could not get 60 votes as it’s currently written.

“I have tremendous respect for both of them, but I think people are looking for something a bit more robust,” said Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.).

The division among Republicans could give leverage to Democrats, who believe they will need to put up the bulk of the votes for any immigration deal in the Senate.

“Let’s do Senate immigration math for a minute. There’s never been … a major immigration measure that’s passed the Senate without an overwhelming Democratic majority and enough Republicans,” Durbin said.

Senators have little time. McConnell wants to end the debate this week, and Trump has set a March 5 deadline, at which point DACA recipients could lose their legal status to stay in the United States.

While the courts could prevent the administration from ending the program, White House chief of staff John Kelly John Francis KellyMORE is warning Trump that won’t extend the deadline.

“I think the time for talking is sort of coming to an end, and now it’s a time for voting,” said Sen. John Cornyn John CornynBipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection Airline job cuts loom in battleground states MORE (R-Texas). “If there’s no deal by the end of the week that, I think, leaves the DACA recipients in some jeopardy.”