Longtime friend of President Trump and Newsmax CEO Chris Ruddy 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’s investigation “poses an existential threat to the Trump presidency.”

Ruddy said Sunday on ABC's “This Week” that he’s worried the Mueller probe isn’t fair to Trump and slammed a report that the special counsel removed an FBI agent from his team for potentially sending anti-Trump text messages.

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"Robert Mueller poses an existential threat to the Trump presidency. He’s gotten four major — two convictions, two plea agreements. Lightning speed," Ruddy said.

The CEO also noted that Ken Starr, the former independent counsel in the Whitewater and Monica Lewinsky scandals during the Clinton administration, spent four years working on the investigation before delivering his first indictment.

“You get a picture that the investigation is out to get the president,” Ruddy said. “It's not a good group of people. I'm concerned … that they're not going to be fair."

Ruddy made the comments just days after Trump's former national security adviser Michael Flynn pleaded guilty to Mueller's charge of lying to FBI agents about his contacts with Russian officials.