Sen. Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) Wednesday urged a vote on a bill he’s co-sponsored to protect 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 from being fired by 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, citing the White House’s unpredictable nature as a reason for his urgency.

“This is the easiest way possible to prevent an entirely predictable constitutional crisis," he said.

"When I press my friends who are Republican senators and leaders and say, ‘What would we do if he were to abruptly fire Robert Mueller,’ they say, ‘well, it’s not going to happen.’ " Coons said. "This is a simple step. … We could take up and pass this bill in a few minutes this afternoon and I’m confident it would get 60 votes.”

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Coons will join Sens. 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.) and Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.) on the Senate floor to try to force a vote on their bill to protect Mueller.

Flake has threatened to vote against any judicial nominee put forth in the lame-duck Senate session until the bill is voted on, giving Republicans no margin for error in their current 51-49 majority in the Senate and 11-10 majority on the Senate Judiciary Committee, on which Flake sits.

Senate Majority Whip John Cornyn John CornynQuinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (R-Texas) on Tuesday said that GOP lawmakers were exploring the possibility of a vote on the bill. 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.) has opposed bringing the measure to the floor for a vote.

"We're whipping that to see where people are. I think the leader needs that information to decide how to manage all the competing demands on our time," Cornyn said when asked about discussions within the Republican caucus about the legislation.

Cornyn added Republicans were willing to hold a vote on the legislation "if that's what it's going to take" to move nominees.

In addition to Flake, several Republican senators, including Sens. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Billionaire who donated to Trump in 2016 donates to Biden Credit union group to spend million on Senate, House races MORE (Maine), Thom Tillis Thomas (Thom) Roland TillisTillis appears to reinforce question about COVID-19 death toll Billionaire who donated to Trump in 2016 donates to Biden Collins: Winner of presidential election will be sworn in next year MORE (N.C.), Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (S.C.) and Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (Iowa), support giving the legislation a vote on the Senate floor.

Coons also mentioned acting Attorney General Matt Whitaker Matthew G WhitakerEx-federal prosecutor: 'Thank God' Whitaker is gone, Barr will bring 'integrity' back to DOJ GOP pollster says Dems are relitigating 2016 election with investigations of Trump Former senior FBI official calls Whitaker hearing ‘disgraceful’ MORE’s past comments criticizing Mueller as another reason to vote on the bill.

“A number of senators of both parties have privately agreed that Whitaker is a less reliable supervisor and may well stumble into interfering with the Mueller investigation or may do it intentionally,” he said.

Whitaker will replace Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE in overseeing the probe and has made several comments in the past that were critical of the inquiry.

He touted in a 2017 interview that there was “no collusion” between the Trump campaign and Russia, adopting a favorite line from the president and undercutting the reason Mueller was appointed. He also said in 2014 that the courts were intended to be the "inferior" branch of government.

He wrote an op-ed for The Hill in May 2017 criticizing the idea of appointing a special counsel for the DOJ’s investigation.

“Serious, bipartisan congressional investigations into the Russian allegations have been under way for weeks and they have made progress. Hollow calls for independent prosecutors are just craven attempts to score cheap political points and serve the public in no measurable way,” he wrote.

His past comments led several high-profile Democrats, including Senate 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 (N.Y.) and current 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 (Calif.) too call for his recusal.