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 (R-S.C.) said in an interview that aired Thursday that only 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 could clear 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 of alleged collusion with Russia.

“The only person in America that can clear Donald Trump is Mueller,” Graham told CBS News’s “This Morning.”

Graham said he would remind the president of the political risks of dismissing Mueller or ending the investigation before the special counsel delivers its findings.

“There is no scenario where you can end this investigation, the Mueller investigation, through some political intrigue, and survive. That's the end of you,” Graham said, expressing his faith in Mueller.

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However, Graham told CBS that doesn’t necessarily mean that 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 has to stay.

“I think he [Trump] wants an attorney general that he has a better working relationship with,” Graham said. “And to those in my business who say, ‘You're stuck with Jeff Sessions’ — I like Jeff Sessions. But, I mean, do you have — how smart do you have to be to understand this, this is not working?”

Graham said last week that Trump is “very likely” to fire Sessions, with whom the president has clashed repeatedly.

Politico reported Wednesday that the president has been urging Republican senators to come to his side on firing Sessions. Trump reportedly became re-energized about firing Sessions after the president's former lawyer Michael Cohen pleaded guilty to eight charges on the same day that Trump’s former 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 was convicted last week.

The president has repeatedly lambasted Sessions. The attorney general fired back last Friday after saying nothing through most of the president’s criticism.

Sessions defended the Department of Justice and maintained that he would remain apolitical.

“While I am Attorney General, the actions of the Department of Justice will not be improperly influenced by political considerations. I demand the highest standards, and where they are not met, I take action,” Sessions wrote in a statement.