House Minority Leader Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) says Democrats will demand that protections for special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE be included in a must-pass spending bill if GOP leaders fail to bring the legislation to the floor.

The Thursday threat comes on the heels of news that Michael Cohen, President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s former personal attorney, has entered into a plea agreement with Mueller and agreed to cooperate in the special counsel’s sprawling Russia probe. Cohen pleaded guilty to lying last year to congressional panels investigating Russian interference in the election.

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“The Congress must immediately pass legislation to preserve the Special Counsel investigation, which is identical to bipartisan legislation passed by the Senate Judiciary Committee," Pelosi said in a statement.

“If Speaker Ryan refuses to take up that bill, House Democrats will fight to include language to protect the investigation in the upcoming must-pass spending bill.”

Pelosi’s Senate counterpart, Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.), has been issuing similar threats ahead of Dec. 7 government funding deadline.

Trump and the GOP need the support of Democrats in the Senate to pass any legislation, though they don't require the cooperation of Democrats in the House.

Trump, meanwhile, is demanding $5 billion for his border wall in the spending package — far more than the $1.6 billion Democrats are willing to give up — which has further raised the prospects of a government shutdown next week.

Both House 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 Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) have said legislation to protect the Russia probe are unnecessary — even after Trump fired Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE and replaced him with acting Attorney General Matthew Whitaker, who has been vocally critical of the Russia probe.

But retiring Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) has vowed to block all judicial nominations until the Senate considers a Mueller protection bill. Senate GOP leaders, seeking to diffuse the situation, said they would gauge support for the legislation.

Efforts by Flake to bring the bill to the Senate floor have been blocked thus far.