Graham warns Trump: Firing Mueller would be 'beginning of the end of his presidency'

Sen. Lindsey GrahamLindsey Olin GrahamCentrist efforts to convince Trump to end shutdown falter Overnight Defense: Four Americans killed in Syria suicide attack | State of the Union becomes latest shutdown flashpoint | Missile defense review on track for Thursday release White House condemns 'terror attack' that killed US troops in Syria MORE (R-S.C.) on Sunday warned of the consequences for President TrumpDonald John TrumpPentagon update to missile defense doctrine will explore space-base technologies, lasers to counter threats Giuliani: 'I never said there was no collusion' between the Trump campaign and Russia Former congressmen, RNC members appointed to Trump administration roles MORE if he tries to fire special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE.

Graham was asked on CNN's "State of the Union" if he is worried Trump is preparing to order Mueller's firing.

"If he tried to do that, that would be the beginning of the end of his presidency, because we're a rule of law nation," Graham said.

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Graham said Mueller is following the evidence where it takes him.

"I think it's very important he be allowed to do his job without interference and there are many Republicans who share my view," Graham said.

Trump has repeatedly dismissed the special counsel's probe into Russia's election interference and possible ties between his campaign and Russia as a "witch hunt" and has denied collusion.

Graham's comments come after Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsBudowsky: Senate must protect Mueller from Barr, President Trump Feinstein grappling with vote on AG nominee Barr Central American women fleeing domestic violence deserve refugee status MORE on Friday fired former FBI Deputy Director Andrew McCabeAndrew George McCabeFISA shocker: DOJ official warned Steele dossier was connected to Clinton, might be biased Rosenstein, DOJ exploring ways to more easily spy on journalists Trump: I never worked for Russia MORE.

In recent days, Trump has taken to Twitter to attack the Mueller probe.

On Saturday, he tweeted the probe "should never have been started in that there was no collusion and there was no crime."

"It was based on fraudulent activities and a Fake Dossier paid for by Crooked Hillary and the [Democratic National Committee], and improperly used in [Foreign Intelligence Surveillance Act] COURT for surveillance of my campaign. WITCH HUNT!" Trump tweeted.

He also called McCabe's firing a "great day for the hard working men and women of the FBI."