Congressional Democratic leadership sent a warning shot to Republicans on Monday saying it would be the "height of irresponsibility and political cynicism" if they reject a plan to end the 10-day government shutdown.

House Democratic Leader Nancy PelosiNancy Patricia D'Alesandro PelosiBoth sides were wrong about Mueller report, and none of it will likely matter for 2020 Elijah Cummings: 'I am begging the American people to pay attention to what's going on' Angus King: 'Mueller passed the obstruction question to the Congress and Barr intercepted the pass' MORE (Calif.) and Senate Democratic Leader Charles SchumerCharles (Chuck) Ellis SchumerDem legal analyst says media 'overplayed' hand in Mueller coverage Former FBI official praises Barr for 'professional' press conference Pelosi: Barr press briefing a 'staggering partisan effort' MORE (N.Y.) urged Republicans to back their plan to fully reopen the government or risk being "complicit" in the partial shutdown.

“If Leader McConnell and Senate Republicans refuse to support the first bill, then they are complicit with President TrumpDonald John TrumpGrassroots America shows the people support Donald Trump Trump speaks to rebel Libyan general attacking Tripoli Dem lawmaker: Mueller report shows 'substantial body of evidence' on obstruction MORE in continuing the Trump shutdown and in holding the health and safety of the American people and workers’ paychecks hostage over the wall," Pelosi and Schumer said in a joint statement.

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They added that if Senate Republicans vote against the dual approach offered by Democrats, after approving a seven-week stopgap bill by voice vote, it would "be the height of irresponsibility and political cynicism."

Democrats unveiled their spending package on Monday evening and are expected to force votes on the two bills on Thursday, when they gain control of the House. One bill would fund the Department of Homeland Security through Feb. 8. The second bill would merge funding through Sept. 30, the end of the 2019 fiscal year, for the remaining six appropriations bills.

But the package ran into immediate opposition from Senate Republicans and House conservatives.

Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellThe Hill's Morning Report — Mueller aftermath: What will House Dems do now? Overnight Health Care: McConnell offering bill to raise tobacco-buying age to 21 | NC gov vetoes 'born alive' abortion bill | CMS backs off controversial abortion proposal HR 1 brings successful local, state reforms to the federal level and deserves passage MORE (R-Ky.) isn't expected to bring up a bill for a vote unless it has President Trump's endorsement. Meanwhile, Rep. Mark MeadowsMark Randall MeadowsThe Hill's Morning Report — Mueller aftermath: What will House Dems do now? Mueller report poses new test for Dems Washington in frenzy over release of Mueller report MORE (R-N.C.), a close ally of Trump's, told The Hill that the Democratic plan was a non-starter.

"Several offers have been made both directly and indirectly to Democrats. All of the offers have been met with reluctance and disapproval. Democrats will give zero money for new border barrier construction and Republicans will not accept this position," Meadows told The Hill.

The back-and-forth comes as Washington is locked in a protracted fight over Trump's border wall. 

Trump has demanded $5 billion for the wall, though lawmakers and administration officials have floated that they would accept half of that — roughly $2.5 billion. Democrats, however, are remaining firm at their cap of $1.3 billion for fencing. 

Meanwhile, Trump has lashed out at Democrats through a string of tweets on social media. He said in a tweet on Monday that they were using a “ridiculous sound bite” to say that a wall “doesn’t work.”

“It does, and properly built, almost 100%! They say it’s old technology - but so is the wheel. They now say it is immoral- but it is far more immoral for people to be dying!,” he said.

In another tweet, Trump implored Democrats to return to Washington, saying that he was “in the Oval Office” and Democrats should “come back from vacation now.”

Talks between the White House and congressional Democrats have largely broken down since Congress missed the Dec. 21 deadline to prevent a shutdown that is impacting roughly a quarter of the government. 
 
Pelosi and Schumer blasted Trump on Monday, saying he "sits in the White House and tweets, without offering any plan that can pass both chambers of Congress."