Senate Republicans are sending a warning shot to 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 as he lashes out at 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, saying they don't think he should fire him and hinting the Senate is unlikely to confirm a successor.

Trump renewed his criticism of Sessions — who was his earliest Senate supporter but has fallen from grace amid the Russia investigation — during a Fox News interview for the attorney general's recusal from matters related to the special counsel investigation into Russia's election interference.

But GOP senators — spanning from conservatives to Trump critics and members of leadership — are throwing their support behind Sessions, a long-time senator who remains popular with his colleagues.

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"We don't have time, nor is there a likely candidate, who could get confirmed, in my view, under these current circumstances," Sen. 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 (Texas), the No. 2 Senate Republican, told reporters.

Asked if there was a date after which it would be easier for Trump to fire Sessions, he added that Sessions and Trump should "work out their differences."

Sessions fired back at the president in a rare statement on Thursday, saying he “will not be improperly influenced by political considerations.”

GOP 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 (Ariz.), a member of the Judiciary Committee and a frequent Trump critic, added that it would be "very difficult" for the Senate to confirm a successor to Sessions. Meanwhile, GOP Sen. 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) said firing him would not be a "wise move."

"I don't see the president being able to get someone else confirmed as attorney general were he to fire Jeff Sessions," Collins told reporters.

Republicans would have a narrow path to getting a new attorney general through the Senate. Their 51-seat majority is effectively capped at 50 with Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.) battling brain cancer.

If just one of Sessions's GOP colleagues decided to vote "no," and if Democrats united against the nomination, Republicans wouldn't have the votes to confirm a replacement.

GOP Sen. Ben Sasse Benjamin (Ben) Eric SasseMcEnany says Trump will accept result of 'free and fair election' McConnell pushes back on Trump: 'There will be an orderly transition' Trump says he'll sign order aimed at protecting premature babies in appeal to religious voters MORE (Neb.) signaled on Thursday that he could vote against another attorney general nominee if Sessions is fired for refusing to be a "political hack."

"I find it really difficult to envision any circumstance where I would vote to confirm a successor to Jeff Sessions if he is fired because he's executing his job rather than choosing to act as a partisan hack," Sasse said from the Senate floor.

Trump's long-running feud with Sessions has been a constant point of division between Senate Republicans, who each voted to confirm him as attorney general, and Trump.

GOP Sen. John Kennedy John Neely KennedyMORE (La.), similar to Cornyn, urged the two men to work out their differences.

"We all want the investigation to be completed. But I think the attorney general is doing a good job. It just breaks my heart to see them at odds. I really would hope that the president would sit down with the attorney general and put any differences aside," he said.

Cornyn added that he didn't believe Sessions had lost support around the Senate, comparing him to a "quintessential Boy Scout."

Speculation about Session's future in the administration hit a fever pitch after GOP Sen. 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.) told Bloomberg that he believed Trump would replace Sessions after the midterm election.

“I think there will come a time, sooner rather than later, where it will be time to have a new face and a fresh voice at the Department of Justice,” Graham said. “Clearly, Attorney General Sessions doesn’t have the confidence of the president.”

Sen. 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 (R-Iowa), the chairman of the Judiciary Committee, separately told Bloomberg that he had time for nomination hearings that he previously didn't have time for, an apparent reference to his previous comments that his panel didn't have time to take up an attorney general nomination.

But some Republicans worry that firing Sessions now — amid growing legal troubles for Trump's orbit in the wake of former Trump personal attorney Michael Cohen's guilty plea and 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's conviction — would only increase speculation that the president is trying to interfere in Mueller's probe.

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 was put in charge of overseeing the investigation after Sessions recused himself.

"Yeah, there are concerns that the domino effect — who is next? I hope he doesn't," Flake said.

Collins added that Sessions was right to recuse himself.

"It certainly would send the wrong message," she said. "The basis of the president's criticism of the attorney general is that he recused himself, appropriately so, from the Russia investigation."