The Senate Judiciary Committee is poised to move forward with legislation 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, a significant shift that comes amid growing pressure from Democrats.

Some Republicans sought to hit the brakes on the bill, but the decision from committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (R-Iowa) shows there is a growing appetite among some in the GOP for a legislative response to President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s apparent willingness to fire the man leading the Justice Department’s investigation into Russia's election meddling.

Just a day earlier, Senate Republicans warned Trump not to take any action against Mueller, saying it would be disastrous. Grassley, in some of the strongest comments from the caucus, said it would be “suicide.”

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But on Wednesday, Trump renewed his attacks on the special counsel, complaining of the “never ending and corrupt Russia investigation.”

Sens. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.), Thom Tillis Thomas (Thom) Roland TillisThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting OVERNIGHT ENERGY: EPA head questions connection of climate change to natural disasters | Pebble Mine executives eye future expansion in recorded conversations | EPA questions science linking widely used pesticide to brain damage in children Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (R-N.C.), Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) and 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.) announced later Wednesday morning that they would merge their competing bills on the special counsel, creating a bipartisan vehicle for action.

In a surprise move, Grassley quickly sought to place the bill on his committee’s agenda, potentially as early as Thursday.

The Iowa Republican had previously voiced concerns that legislation hindering Trump’s ability to fire Mueller might be unconstitutional.

As recently as Tuesday, Grassley sidestepped questions about whether he would allow similar legislation to come up, telling a flock of reporters that he hasn’t “missed a vote since 1993.”

Grassley’s decision appeared to catch even members of Republican leadership off guard.

Sen. John Thune John Randolph ThuneSenate GOP sees early Supreme Court vote as political booster shot Romney backs pre-election Supreme Court vote, paving way for McConnell, Trump Senate GOP faces pivotal moment on pick for Supreme Court MORE (S.D.), the No. 3 GOP senator, told reporters, “I’m anxious to hear from Chuck about what his thoughts are on the process.”

Members of the Judiciary Committee acknowledged they learned about Grassley’s thinking from reporters.

“I haven’t [been notified],” said Senate Majority Whip John Cornyn John CornynThe 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 Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Texas). “Maybe my staff has; I have to rely on the press.”

“I have not. I just work here. Nobody tells me anything,” quipped Sen. John Kennedy John Neely KennedyMORE (R-La.).

Asked why he thought Grassley agreed to bring up the controversial bill, he added, “I bet you if you ask Chuck he’ll tell you, because I don’t know.”

To place the legislation on the agenda on Thursday, spokesman George Hartmann noted that Grassley needs Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (Calif.), the top Democrat on the panel, to sign off on the move because “committee rules require such assent within 72 hours of a markup.”

Instead, it appears the committee will delay the bill until next week. Feinstein said in a statement early Wednesday evening that she and Grassley have agreed “not to take action this week but instead place the bill on the committee’s markup calendar next week.”

Feinstein noted she is “worried about an amendment ... that could undermine the investigation” and hadn’t yet been able to review it.

Any member, under committee rules, can also delay a vote on the bill for a week once it has been placed on the agenda.

But the decision to give the legislation a vote marks one of the largest fractures to date between Trump and congressional Republicans, who have been wary of bucking the president heading into the midterm elections.

Under the Senate legislation, Mueller or any other special counsel would receive an “expedited judicial review” within 10 days of being fired to determine if it was for a “good cause.” If it were found not to be, the special counsel would be reinstated. The measure also codifies into law that only a senior Justice Department official can fire a special counsel.

Republicans are redoubling their efforts to urge Trump not to fire Mueller following the FBI’s raid on the office, home and hotel room of the president’s personal lawyer, Michael Cohen. That action enraged the president, who called it an “attack on our country.”

In the aftermath of the raid, the White House’s message on the Mueller investigation also changed.

Rather than deny that the president was considering firing Mueller, White House press secretary Sarah Huckabee Sanders asserted that the president believes he has the power to dismiss the special counsel.

“We’ve been advised that the president certainly has the power to make that decision,” she said.

Democrats have seized on the remarks from Trump and the White House to renew pressure on GOP leadership to bring up legislation protecting Mueller.

“I say to my Republican colleagues, you can no longer rely on anonymous sources as a reason for delay or inaction on legislation to protect Mr. Mueller and avoid a constitutional crisis,” Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) said on Wednesday.

Booker separately noted Trump is signaling he believes he has the “power” and the “will” to fire Mueller, giving the legislation “newfound urgency.”

But the bill faces long odds of passing the chamber, much less becoming law.

More than half of the Republicans on the Judiciary Committee, including Grassley, have questioned whether legislation limiting Trump’s ability to fire Mueller is unconstitutional or have suggested a bill isn’t needed.

“I’ve never been convinced that it’s constitutional for us to tell the president who he can hire and fire,” said Kennedy, a member of the committee.

Asked if he would vote against it, he added, “That’s my plan right now.”

A spokesman for GOP Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (Utah) said he believes the legislation is unconstitutional.

Grassley also hasn’t said he will support the bill, despite bringing it up for the vote.

A spokesman didn’t respond to a question about his position, or reports that he wants to offer an amendment.

With at least Tillis and Graham expected to join with every Democrat in voting “yes,” the bill would have the votes to clear the committee. But how it gets 60 votes or the two-thirds majority needed to overcome a potential veto is less clear.

“I don’t know the answer to that. ... The biggest question I would have is, if it did pass, would the president sign it? I think it’s unlikely that he would,” Cornyn said, asked about potential floor time.

Thune added that Grassley would need to talk to McConnell “about whether he wants to move it out [to] the floor and vote on it.”

“No, not at 60, for sure,” he said, asked if he thought it could pass the Senate.

The bill would face an even rockier path in the House, where some conservative hard-liners are publicly urging Trump to fire Justice Department officials.

In addition to opposition from Trump allies and libertarian-minded senators like Lee, the special counsel bill is getting a skeptical reception from more moderate members of the caucus.

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.) — who reiterated on Wednesday that he has “full confidence” in Mueller — said this week that he is “not convinced that what’s been put forward is constitutional.”

Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine), another moderate, said there are “legitimate” constitutional issues with the legislation.

“I wish there weren’t, but there are,” she said.

Alexander Bolton contributed.