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

Sen. John McCainJohn Sidney McCainTrump hits McCain on ObamaCare vote GOP, White House start playing midterm blame game Arizona race becomes Senate GOP’s ‘firewall’ MORE (R-Ariz.) on Sunday praised special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE amid speculation that President TrumpDonald John TrumpHannity urges Trump not to fire 'anybody' after Rosenstein report Ben Carson appears to tie allegation against Kavanaugh to socialist plot Five takeaways from Cruz, O'Rourke's fiery first debate 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 Jay RosensteinHannity urges Trump not to fire 'anybody' after Rosenstein report Rosenstein: 'I never pursued' trying to record Trump Trump vows to get rid of 'stench' at DOJ, FBI 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 ManafortFormer White House lawyer sought to pay Manafort, Gates legal fees: report Mueller investigating Russian payments made by Trump Tower meeting organizers: report Cohen questioned for hours in Mueller probe about Trump's dealings with Russia: report MORE. He also filed charges against 13 Russians and three Russian organizations for allegedly interfering in the 2016 election.