Senate Republicans are showing no signs they will wrap up their Russia investigations soon despite pressure from the White House.

They’re also pushing back on the prospect that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE will fire special counsel Robert Mueller, which they fear would spark a backlash that could hurt the GOP in next fall’s midterm elections.

“Everybody knows that if Trump fired Mueller it would be interpreted by everybody who writes about this as evidence that he’s done something wrong,” said a strategist close to the Senate GOP leadership.

Senate Republican 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 (Texas), a member of the Intelligence and Judiciary committees, said on ABC’s “This Week” that it would be a “mistake” to fire Mueller.

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The Judiciary panel led by Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa) is also conducting an investigation. The Judiciary Committee’s work has been slowed by the reluctance of the administration to share documents and a dispute between Grassley and Sen. Dianne Feinstein Dianne Emiel FeinsteinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Democrats shoot down talk of expanding Supreme Court Biden leads Trump by 12 points among Catholic voters: poll MORE (D-Calif.) over its focus.

“We have to go until we get done with it,” Grassley said Monday. “What’s frustrating here for me is we’re getting these instances where people can get information under [the Freedom of Information Act] faster than we can.”

Grassley agreed with Cornyn that Trump shouldn’t fire Mueller, but also said he doesn’t think the president will dismiss the special counsel.

“I think there are people raising this issue just to bring visibility and to test him for political reasons,” he said.

While there are indications that the House Intelligence Committee is getting close to completing its work, Senate Intelligence Committee Chairman Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.), who initially wanted to complete his probe by the end of the year, says he still has dozens of witnesses to interview in private.

Senate Republicans believe it would be counterproductive to pressure a quick end to the investigations, the strategist said.

So far, no smoking-gun evidence has emerged implicating the president of colluding with Russia, although former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE and former national security adviser Michael Flynn have been charged with crimes. Flynn and another campaign aide, George Papadopoulos, are cooperating with Mueller’s probe.

Nonetheless, many Republicans still hope Mueller will resolve allegations that Russia colluded with the Trump campaign to defeat Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE.

They say the best way to end the controversy is to let the facts come to light.

The political strategy also reflects the fact that Senate Republicans want to project some independence from Trump. After losing Virginia’s gubernatorial race and seeing an upset in Alabama’s Senate election last week, there are fears that anger with Trump could sink GOP majorities in the House and Senate in 2018.

At the same time, Senate Republicans have joined members of the House in laying out the beginnings of a public argument that could be used against Mueller and his team if they do find that Trump colluded.

The strategist says Trump and his Republican allies have gained political leverage in recent weeks by the disclosure that Mueller removed a senior investigator, Peter Strzok, from his team after learning of disparaging statements he made about Trump during the campaign.

Members of Mueller’s investigative team have also drawn criticism for making political donations to Clinton’s presidential campaign and to other Democrats. Some gave money to Republicans, but the overwhelming majority went to Democrats.

Instead of encouraging Trump to fire Mueller or pressing for the Russia investigations to end in the next few weeks, Senate Republicans have chipped away at Mueller’s credibility, which might soften the political blow if he issues a damning report on the activities of Trump’s campaign and inner circle.

Cornyn tweeted over the weekend that he would wait to see what Mueller finds before passing judgment on the investigation. But he also fired a warning shot by urging Mueller to “clean house of partisans.”

“Everybody’s been forced to admit that Mueller’s team is stacked with the worst kind of partisans and you have the phone records to prove it,” said the strategist.

The strategist said these reports have been damaging to Mueller, but that firing the special counsel could undo that progress.

“Why would you want to undermine a monthlong drumbeat of evidence that this effort is compromised by going out there and creating a completely different narrative?” the strategist said.

Other Senate Republicans in addition to Cornyn have raised questions over whether Mueller’s team has a political bias.

Sen. James Lankford James Paul LankfordMcConnell works to lock down GOP votes for coronavirus bill Charities scramble to plug revenue holes during pandemic Warren calls for Postal Service board members to fire DeJoy or resign MORE (R-Okla.), a member of the Intelligence Committee, told CBS’s “Face the Nation” over the weekend that “it’s serious any time you have an investigator within an investigation [who] has an obvious political bias, whichever direction that goes.”

Sen. Roy Blunt Roy Dean BluntSocial media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R-Mo.), another member of the Intelligence panel, told The Washington Post last week that he was “concerned” that Mueller “couldn’t put a team together that wasn’t so overwhelmingly on one side of the ideological spectrum.”

Judiciary panel Republicans have delved into the FBI’s handling of the Clinton email controversy and into the Obama administration’s approval of a controversial uranium deal with Russia while Clinton was serving as secretary of State, another effort that could muddy the waters.