Former Defense Secretary Robert Gates predicted this week that special counsel Robert MuellerRobert (Bob) Swan MuellerHouse progressive: Pelosi 'has it right' on impeachment Democrats talk subpoena for Mueller Democratic Rep. Ro Khanna: 'I'm not there yet' on impeachment MORE's conclusions in the Russia probe could "elate" some people while angering others. 

"People need to be prepared that a guy like Bob Mueller may come to a different conclusion that will elate some people and anger some people," Gates told NBC's “Meet the Press” in an interview airing on Sunday. 

Gates, who served under former Presidents George W. Bush and Obama, expressed his confidence in Mueller as head of the investigation. 

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"The Bob Mueller I know is a man of extraordinary integrity and character. I can't think of anybody who would do a more honest and stand-up job of conducting an investigation. And, you know, people need to be prepared, people are assuming he's going to come to one conclusion," he said. 

Mueller's probe has moved closer into President TrumpDonald John TrumpTrump rips Dems' demands, impeachment talk: 'Witch Hunt continues!' Nevada Senate passes bill that would give Electoral College votes to winner of national popular vote The Hill's Morning Report - Pelosi remains firm despite new impeachment push MORE's inner circle. 

The special counsel's team has sat down with Trump's former chief of staff Reince PriebusReinhold (Reince) Richard PriebusNadler subpoenas Hope Hicks and McGahn's former aide for testimony Mueller didn't want Comey memos released out of fear Trump, others would change stories Forget the spin: Five unrefuted Mueller Report revelations MORE, his former press secretary Sean SpicerSean Michael SpicerProgressive groups targeting Harvard, other universities with ad urging them to not hire Trump officials Celebs unwind at Capitol File WHCD after party Journalists close out WHCD at MSNBC/NBC News after-party MORE and current White House communications director Hope HicksHope Charlotte HicksThe Hill's Morning Report - Pelosi remains firm despite new impeachment push Trump defends denying McGahn's testimony House Democrats press leaders to start Trump impeachment MORE

Mueller is set to interview Trump's former chief strategist, Stephen Bannon, next week. 

Trump himself has said he is looking forward to talking with Mueller, however, The New York Times reported Thursday that the president attempted to fire Mueller last June, but backed off after White House counsel Don McGahn refused Trump’s order and threatened to quit.

The president called the reports "fake news."