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 on Thursday called a bipartisan Senate proposal on immigration a "catastrophe" that would undermine law enforcement and grant amnesty to "dangerous criminals."

The deal, supported by a group of centrist lawmakers, would protect "Dreamers" – young immigrants brought to the U.S. illegally as children – in exchange for roughly $25 billion for border security.

Trump criticized the bill in a series of tweets Thursday afternoon, calling it a "vote against law enforcement."

"The Schumer-Rounds-Collins immigration bill would be a total catastrophe. @DHSgov says it would be 'the end of immigration enforcement in America,'" Trump tweeted, referred to Sens. Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.), 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.) and 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), the bill's sponsors. "It creates a giant amnesty (including for dangerous criminals), doesn’t build the wall, expands chain migration, keeps the visa lottery, continues deadly catch-and-release, and bars enforcement even for FUTURE illegal immigrants."

"Voting for this amendment would be a vote AGAINST law enforcement, and a vote FOR open borders. If Dems are actually serious about DACA, they should support the Grassley bill!"

The Schumer-Rounds-Collins immigration bill would be a total catastrophe. @DHSgov says it would be “the end of immigration enforcement in America.” It creates a giant amnesty (including for dangerous criminals), doesn’t build the wall, expands chain migration, keeps the visa... — Donald J. Trump (@realDonaldTrump) February 15, 2018

...lottery, continues deadly catch-and-release, and bars enforcement even for FUTURE illegal immigrants. Voting for this amendment would be a vote AGAINST law enforcement, and a vote FOR open borders. If Dems are actually serious about DACA, they should support the Grassley bill! — Donald J. Trump (@realDonaldTrump) February 15, 2018

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Trump's tweet threw into further doubt the future of the bipartisan deal, introduced in the Senate late Wednesday.

White House press secretary Sarah Huckabee Sanders said earlier Thursday that Trump would veto the bipartisan Senate deal if it were sent to his desk for signing.

Trump's comments Thursday signal a shift from his past claim in January that he would sign whatever piece of immigration legislation Congress would send to his desk.

"I'm not going to say, 'Oh gee I want this or I want that,'" Trump told lawmakers at the time. "I will be signing it."

The White House has pushed for a much broader plan to overhaul the country's immigration system that would seek to curb legal immigration and provide funding for the construction of Trump's long-promised border wall between the U.S. and Mexico.

Part of that proposal hinges on curbing family-based immigration and ending the diversity lottery program, which provides visas to certain people from countries with historically low levels of immigration to the U.S.

Trump has insisted that lawmakers pursue a system of merit-based immigration that would prioritize entry to foreigners with skills deemed beneficial to the U.S.

Democrats, however, have said that the White House's proposal, which is sponsored in the Senate by Sen. Chuck Grassley (R-Iowa), is a non-starter.