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

Sen. Lindsey GrahamLindsey Olin GrahamPassage of the John Lewis Voting Rights Advancement Act is the first step to heal our democracy Progressive support builds for expanding lower courts McConnell backs Garland for attorney general MORE (R-S.C.) on Sunday warned of the consequences for President TrumpDonald TrumpSenators given no timeline on removal of National Guard, Capitol fence Democratic fury with GOP explodes in House Georgia secretary of state withholds support for 'reactionary' GOP voting bills MORE if he tries to fire special counsel Robert MuellerRobert (Bob) MuellerWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump 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 SessionsManchin flexes muscle in 50-50 Senate Udalls: Haaland criticism motivated 'by something other than her record' Ocasio-Cortez targets Manchin over Haaland confirmation MORE on Friday fired former FBI Deputy Director Andrew McCabeAndrew George McCabeJohn Durham's endgame: Don't expect criminal charges Carter Page sues over surveillance related to Russia probe McCabe defends investigation of Trump before Senate committee: We had 'many reasons' 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."