Former special prosecutor Ken Starr said Wednesday that former special counsel Robert MuellerRobert (Bob) Swan MuellerLewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network Mueller report fades from political conversation 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 John TrumpTrump conversation with foreign leader part of complaint that led to standoff between intel chief, Congress: report Pelosi: Lewandowski should have been held in contempt 'right then and there' Trump to withdraw FEMA chief nominee: report 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 ClintonMost voters say there is too much turnover in Trump administration RNC spokeswoman on 2020 GOP primary cancellations: 'This is not abnormal' Booker dismisses early surveys: 'If you're polling ahead right now, you should worry' 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.