McCain: Mueller must be allowed to finish investigation 'unimpeded'

Sen. John McCainJohn Sidney McCainMichelle Obama weighs in on Trump, 'Squad' feud: 'Not my America or your America. It's our America' Meghan McCain shares story of miscarriage Media cried wolf: Calling every Republican a racist lost its bite MORE (R-Ariz.) on Sunday praised special counsel Robert MuellerRobert (Bob) Swan MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump MORE amid speculation that President TrumpDonald John TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller MORE may be preparing to fire him. 

“Special Counsel Mueller has served our country with honesty and integrity. It’s critical he be allowed to complete a thorough investigation into Russia’s interference in the 2016 election — unimpeded,” McCain tweeted.

Trump has at various times this weekend lashed out at the FBI, Department of Justice and Mueller probe, prompting speculation he might call for Mueller's firing.

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On Saturday, he asserted that Mueller's investigation should never have been opened in the first place. On Sunday, he attacked the makeup of Mueller's team, claiming it is unfairly stacked with Democrats. Mueller himself is a Republican.

The tweets came shortly after Trump's lawyer, John Dowd, called on Deputy Attorney General Rod RosensteinRod Rosenstein10 questions for Robert Mueller What to expect when Mueller testifies: Not much Trump says he won't watch Mueller testimony MORE, who oversees Mueller's investigation, to shut down the probe.

On Sunday, lawmakers from both sides of the aisle warned Trump against firing the special counsel. Sen. Lindsey Graham (R-S.C.) suggested such an action would be "the beginning of the end" of Trump's presidency.

Mueller has obtained guilty pleas from three former Trump associates, and indicted former Trump campaign chairman Paul ManafortPaul John ManafortWebb: Questions for Robert Mueller Top Mueller prosecutor Zainab Ahmad joins law firm Gibson Dunn Russian oligarch's story could spell trouble for Team Mueller MORE. He also filed charges against 13 Russians and three Russian organizations for allegedly interfering in the 2016 election.