Senate Majority Whip John Cornyn thinks it would be a political blunder for President Trump to fire special counsel Robert Mueller, who is investigating Russia’s interference in the 2016 presidential election and possible collusion between Trump’s campaign and the Russians.

“I believe the president’s own lawyer says that’s not going to happen. I think that would be a mistake myself,” Cornyn told ABC’s “This Week” on Sunday.

Cornyn says he has confidence in Mueller’s team to complete a fair investigation, as long as Mueller removes investigators from his team who have a conflict of interest.

“I have a lot of admiration and respect for [former FBI] Director Mueller. But I would think he would want to eliminate challenges to the integrity of his investigation by eliminating agents who have taken positions either in text message or through their political activity that undermine the integrity of the results of the investigation,” Cornyn said.

Peter Strzok, a top FBI counterintelligence agent who was part of Mueller’s investigation, was removed from the team and demoted after it was revealed that he sent messages critical of Trump.

Strzok and Lisa Page, a lawyer who had also been assigned to the Mueller probe and has since been removed, were found to have exchanged anti-Trump and pro-Hillary Clinton messages during the 2016 presidential campaign.

The texts were shared with Congress and reporters early last week.

Cornyn said he commends Mueller for removing Strzok and Page from his team, but “he needs to make sure he vets that team.”

“There are plenty of FBI agents and prosecutors who have not been politically involved on behalf of Democrats or overtly critical of the president that can serve in this important investigation,” Cornyn said.