House Republican leaders are struggling to secure 218 votes for a compromise GOP immigration bill, despite a personal plea from President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Tuesday to pass the legislation.

Conservatives aren’t promising to support the bill ahead of Thursday’s vote, and it’s far from clear the GOP can win its approval.

“I think getting this compromise bill to the finish line is going to be a lot more challenging than I would have anticipated,” centrist Rep. Ryan Costello Ryan Anthony CostellloTrump struggles to stay on script, frustrating GOP again Bottom line Former GOP Rep. Costello launches lobbying shop MORE (R-Pa.) told reporters Wednesday. “The conservatives aren’t going along with it.”

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“I know other members who are apprehensive,” added Rep. Scott DesJarlais (R-Tenn.), a member of the far-right House Freedom Caucus who is leaning against the bill. “I think [the vote] will be really close.”

If the measure goes down in flames, leadership will be left without a clear plan to prevent immigrant families from being separated at the U.S.-Mexico border, which is creating a political crisis for the Trump administration and Republicans.

Trump appeared to take steps to end the crisis later on Wednesday, saying he would sign an executive order to address the issue. The White House did not immediately provide details on what the executive order would do.

That could solve the most pressing issue for Congressional Republicans, but the House GOP would be stuck with no clear path forward for protecting “Dreamers” who came to the United States illegally as children and have seen Trump unwind an Obama-era program allowing them to work and live in the country. Pressure to take action on this issue had led to a near revolt by vulnerable GOP centrists this summer.

Several members of the 160-member Republican Study Committee told the Hill they are either opposed or leaning against the compromise bill. The conservative group will huddle Wednesday afternoon to decide whether to take a position.

Groups on the right including NumbersUSA and Heritage Action are deriding the compromise bill as “amnesty” for providing a path to citizenship for up to 1.8 million Dreamers. Conservative lawmakers fear they’ll be attacked from the right if they vote for the bill.

Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) and his leadership team informed members on Wednesday they’re pushing ahead with Thursday votes on a pair of rival immigration bills: the compromise legislation negotiated between centrist and conservative Republicans, and a more hardline measure authored by Judiciary Chairman Bob Goodlatte Robert (Bob) William GoodlatteNo documents? Hoping for legalization? Be wary of Joe Biden Press: Trump's final presidential pardon: himself USCIS chief Cuccinelli blames Paul Ryan for immigration inaction MORE (R-Va.).

“We don't think families should be separated. Period. We've seen the videos and heard the audio,” Ryan told reporters, referring to recordings of detained immigrant children crying and calling for their parents.

But neither measure is likely to pass with 218 votes.

Conservatives are pushing for last-minute changes to the compromise bill, including language that would prevent Dreamers from being able to apply for green cards for their parents after they become citizens.

When pressed on whether the legislation could be tweaked before the vote, Goodlatte said “there’s lots of discussions going on.”

“I can’t really say what would happen, but it’s certainly possible other things could happen,” Goodlatte said. “But we’re not there yet.”

There was some discussion among House members Wednesday morning about just taking up whatever bill the Senate passes.

“I’m hearing that the Senate may move the Cruz bill,” said Rep. Fred Upton Frederick (Fred) Stephen UptonOn Paycheck Protection Program, streamlined forgiveness is key Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Progressives soaring after big primary night MORE (R-Mich.). “A couple members are individually saying why don’t we take that up and pass it today.”