Special counsel Robert Mueller's team interviewed former White House chief of staff Reince Priebus on Friday, signaling that the special counsel's Russia probe is reaching into the top levels of President Trump's team.

“Mr. Priebus was voluntarily interviewed by Special Counsel Mueller’s team today. He was happy to answer all of their questions," Priebus' lawyer William Burck told The Hill.

Politico was the first to report on the interview.

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Trump dismissed Priebus from his White House post in July as part of a major staff shakeup, replacing him with retired Gen. John Kelly John Francis KellyMORE.

Mueller's probe into ties between Trump campaign associates and Russia during last year's election is thought to have expanded to current and former White House officials.

Politico reported on Thursday that Trump lawyers were mulling a potential interview between Mueller and Trump.

Fox News reported last month that the special counsel had begun interviewing White House staffers, while CNN reported last week that Mueller’s investigative team met earlier this summer with former British intelligence agent Christopher Steele, who authored the controversial, unverified dossier on alleged ties between Trump and Russia.