House GOP leaders have put a compromise immigration bill on ice after 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 said Friday he “certainly” would not sign the legislation.

Trump’s comments have thrown into doubt whether House Republicans will even take up the thorny issue of immigration this crucial election year. Immigration votes had been planned for next week.

Republican leaders at the last-minute scrapped a planned Friday whip check on the compromise bill. Instead, they will try to gauge support for the bill next week after they get clarification about what exactly Trump meant in his Friday interview on Fox News, Chief Deputy Whip Patrick McHenry Patrick Timothy McHenryCheney battle raises questions about House GOP's future Hillicon Valley: Democrats request counterintelligence briefing | New pressure for election funding | Republicans urge retaliation against Chinese hackers House Republicans urge Trump to take action against Chinese hackers targeting coronavirus research MORE (R-N.C.) told reporters.

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McHenry cautioned that House Republicans won’t “take on” immigration unless they have Trump's backing.

“We want to get clarity on the president’s position on this bill,” McHenry said just off the House floor. “Republicans are not going to take on immigration without the support and endorsement of President Trump.”

Even if leadership pushes ahead with the vote, one key lawmaker questioned whether Thursday is still a realistic timetable.

“In light of everything, I think it's fair to ask the question: Is next Thursday premature on these two votes?” said Rep. Mark Walker Bradley (Mark) Mark WalkerJoe Biden has long forgotten North Carolina: Today's visit is too late Mike Johnson to run for vice chairman of House GOP conference The Hill's Morning Report - Sponsored by National Industries for the Blind - Woodward book revelations rock Washington MORE (R-N.C.), chairman of the conservative Republican Study Committee (RSC).

Trump later tweeted a list of priorities that are already included in the compromise immigration bill.

The Democrats are forcing the breakup of families at the Border with their horrible and cruel legislative agenda. Any Immigration Bill MUST HAVE full funding for the Wall, end Catch & Release, Visa Lottery and Chain, and go to Merit Based Immigration. Go for it! WIN! — Donald J. Trump (@realDonaldTrump) June 15, 2018

Trump’s impromptu remarks threw a wrench into GOP leadership’s immigration plans.

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Republican leaders, who were desperate to stave off a discharge petition from centrists that would force a free-wheeling immigration debate on the House floor, reached an agreement to hold two votes next week on a pair of immigration bills, including the compromise measure and a more hard-line bill from House Judiciary Committee Chairman Bob Goodlatte (R-Va.).

Speaker Paul Ryan (R-Wis.) earlier in the week said that Trump was “excited” about the compromise bill, while White House senior adviser Stephen Miller had met with conservatives on Capitol Hill to rally support for the immigration framework.

But several top House conservatives declared the 293-page compromise bill “dead on arrival” following Trump’s comments Friday.

Trump’s remarks were a “relief,” said Rep. Steve King Steven (Steve) Arnold KingTrump, Biden deadlocked in Iowa: poll GOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP MORE (R-Iowa), an immigration hard-liner who predicted that votes on both immigration bills would fail next week.

Asked if Republicans could pass an immigration bill without Trump’s support, Rep. Jim Jordan James (Jim) Daniel JordanHouse panel pulls Powell into partisan battles over pandemic Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus MORE (R-Ohio), a former chairman of the House Freedom Caucus, tersely replied: “No.”

The compromise immigration bill is “on life support,” added Rep. Robert Aderholt Robert Brown AderholtLobbying world The Hill's Coronavirus Report: WHO vs. Trump; Bernie's out Bottom line MORE (R-Ala.), an RSC member who opposes that legislation.

Rep. Michael McCaul Michael Thomas McCaulHouse passes legislation to crack down on business with companies that utilize China's forced labor House Republicans blame Chinese cover-up for coronavirus pandemic Engel subpoenas US global media chief Michael Pack MORE (R-Texas) said they were expecting the White House to put out a statement “any minute” clarifying Trump’s comments.

Rep. Ileana Ros-Lehtinen Ileana Carmen Ros-LehtinenEx-Florida GOP congresswoman under federal investigation: report 'Trump show' convention sparks little interest on K Street Shalala to face Salazar in Florida rematch MORE (R-Fla.), who is facing a tough reelection bid in a district that Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE won by nearly 20 points in 2016, added, “This is going to be a cliffhanger.”

The compromise measure sticks to the four main pillars demanded by Trump: It creates a new merit-based visa program for so-called Dreamers, provides $25 billion for border security, ends the diversity visa lottery program and limits family-based migration.

The legislation goes even further by including a trigger mechanism to halt the new visas if Congress denies funding for the border wall, ending the separation of immigrant children and parents at the border, and ending “catch and release” immigration loopholes.

Centrist Rep. Mario Diaz-Balart Mario Rafael Diaz-Balart'Trump show' convention sparks little interest on K Street Rep. Dan Meuser tests positive for COVID-19 Watchdog calls for probe into Gohmert 'disregarding public health guidance' on COVID-19 MORE (R-Fla.), one of the key negotiators, said the compromise bill is the last, best chance for any immigration and border security proposal to become law this year.

“It's the only shot at [the wall] and it's the only shot, I believe ... to legalize the Dreamers, stop the deportation of the Dreamers, and to have a permanent fix for them," said Diaz-Balart.

This isn't the first time that Trump has scuttled GOP leadership's plans by announcing last-minute opposition to a bill.

Hours before the House was scheduled to vote on controversial legislation renewing the National Security Agency’s warrantless surveillance program in January, Trump tweeted that the program was used to "badly surveil and abuse the Trump Campaign."

Capitol Hill was instantly thrown into confusion ahead of what was already expected to be a tight vote before Trump walked back his comments in a separate tweet.

Rafael Bernal and Juliegrace Brufke contributed.

Updated at 1:19 p.m.