Senate Democratic Leader Charles Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (N.Y.) is warning Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) not to backtrack on a promise to take up immigration legislation next month.

“If he does not honor our agreement, it will be a breach of trust, not only with the Democratic senators but with several members of his own party as well,” Schumer warned.

Schumer has come under fire from fellow Democrats and liberals for ending a three-day government shutdown based on a McConnell promise to take up immigration legislation next month.

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Democrats voted Monday for a three-week spending measure to reopen the government after McConnell promised to bring immigration debate with a “level playing field at the outset and an amendment process that is fair to all sides” after Feb. 8 — if leaders don’t negotiate an immigration deal before then.

Many Democrats, however, don’t think McConnell can be trusted. They say the GOP leader failed to deliver on his promise to Sen. Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) on bringing up legislation to shore up ObamaCare’s individual market by the end of 2017. They are also hailing McConnell’s commitment, unmet so far, to Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican 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 MORE (R-Ariz.) to move an immigration bill in January.

McConnell told Flake he would move a bill to help an estimated 800,000 immigrants known as "Dreamers" “if negotiators reach an agreement on these matters by the end of January.”

A bipartisan group of negotiators reached a deal to protect immigrants who came to the country illegally as children from deportation but McConnell did not move the bill because President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE opposed it, as did many members of his own conference.

Schumer said that leaders have only 16 days until government funding runs out again to craft an immigration agreement, after which McConnell has promised an open floor debate.

He said he believes there is now enough political will in the Senate to pass a bill before the March 5 deadline Trump set after rescinding the Deferred Action for Childhood Arrivals (DACA) program in September.

“I am more hopeful today than last week that we can assemble 60 votes for a DACA bill in the Senate and we now have a real pathway to get such a bill through the Senate,” Schumer said.