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

Sen. John McCainJohn Sidney McCainTrump attacks Meghan McCain and her family In Montana, a knock-down redistricting fight over a single line McCain: Ivanka Trump, Jared Kushner had 'no goddamn business' attending father's funeral MORE (R-Ariz.) on Sunday praised special counsel Robert MuellerRobert (Bob) MuellerSenate Democrats urge Garland not to fight court order to release Trump obstruction memo Why a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel MORE amid speculation that President TrumpDonald TrumpHillicon Valley — Presented by Xerox — Twitter's algorithm boosts right-leaning content, internal study finds Ohio Democrat calls Vance an 'ass----' over Baldwin tweet Matt Taibbi says Trump's rhetoric caused public perception of US intelligence services to shift 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 RosensteinWashington still needs more transparency House Judiciary to probe DOJ's seizure of data from lawmakers, journalists The Hill's Morning Report - Biden-Putin meeting to dominate the week 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 ManafortHuawei paid Tony Podesta 0K for White House lobbying FBI agents swarm Russian oligarch's DC home DOJ investigating one-time Trump campaign adviser over alleged ties to Qatar: report MORE. He also filed charges against 13 Russians and three Russian organizations for allegedly interfering in the 2016 election.