Former FBI official Kevin Brock on Thursday said that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE is unbiased and won't be “colored by politics” in his ongoing Russia investigation, citing his personal working experience with the former FBI director.

“In my personal dealings with him, I’ve never heard him utter a word in any situation — I’ve been in many, many meetings, even in hallway conversations — [that] gave any indication of what his political leanings were or any biases or anything like that,” Brock, who served as a former assistant director of intelligence at the FBI for 23 years, told Hill.TV’s Krystal Ball.

“The man is a prosecutor, that’s what he does. If he sees an opportunity to bring somebody to justice — he’s going to do that and it’s not going to be colored by politics,” he continued.

President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE has repeatedly lashed out at Mueller, calling his investigation into Russian election interference and possible collusion between Moscow and the Trump campaign a “witch hunt” and a “hoax.”

Trump in November claimed that Mueller was “a conflicted prosecutor gone rogue” who was doing “TREMENDOUS damage” to the criminal justice system.

Lawmakers from both sides of the aisle have called for legislation that would safeguard Mueller and his investigation into Russian meddling in the 2016 presidential election.

In April, Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) co-sponsored a bill with Sens. Thom Tillis (R-N.C.), Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) and Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) to protect Mueller. The bill would essentially codify Department of Justice regulations that say a special counsel can only be fired by a senior official and would give them the ability to challenge their firing in court.

Even though the bipartisan legislation was overwhelmingly approved by the Judiciary Committee, Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) has blocked the bill from reaching the Senate floor.

McConnell argues that such a bill is “not necessary” because he doesn’t believe Trump would ever fire Mueller.

– Tess Bonn