Former special prosecutor Ken Starr said Wednesday that former special counsel Robert MuellerRobert (Bob) MuellerWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump MORE has done a “grave disservice to our country” in his handling of the probe into Russian interference in the 2016 election and possible obstruction of justice by President TrumpDonald TrumpSchumer: Impeachment trial will be quick, doesn't need a lot of witnesses Nurse to be tapped by Biden as acting surgeon general: report Schumer calls for Biden to declare climate emergency MORE.

“The entire process has been so unfortunate,” Starr told Fox News. “I love Bob Mueller as a human being, as a patriot, but I think he’s done a grave disservice to our country in the way that he conducted this investigation.”

Starr, who headed the investigation that led to the impeachment of former President Bill ClintonWilliam (Bill) Jefferson ClintonBiden knows healing the US means addressing pandemic and economy first Can the media regain credibility under Biden? McConnell proposes postponing impeachment trial until February MORE, added that Mueller didn’t adequately create a balanced and unbiased team to take part in the two-year investigation.

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“He said time and again, ‘I don’t question politics of my staff.’ I understand that, but you aren’t blind to what your staff members are all about as human beings,” Starr said.

He added: “What steps did Bob Mueller take to assure the American people that he had a fair and balanced staff? That was one thing that I thought was very revealing and missing.”

Starr’s comments come as Mueller takes center stage in Congress on Wednesday, delivering testimony and fielding questions from House Judiciary and Intelligence Committee lawmakers on his team’s lengthy report and the conclusions it made about Russian collusion and possible obstruction by Trump.

He said in March that Mueller was barred from releasing a public report releasing his findings, saying he must not violate what he called one of the fundamental principles of public prosecution: "Thou shalt not drag a subject or target of the investigation through the mud via public criticism.”

Starr, who served as president of Baylor University, resigned from his then-position as a law school professor in 2016 over complaints that the university mishandled allegations of sexual assault involving its football team.