A former ethics lawyer for former President George W. Bush said Friday 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 closing in on the "basic structure" of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's family business, the Trump Organization, and suggested that Mueller may find "quite ugly" information in the president's unreleased tax returns.

Speaking on MSNBC's "The 11th Hour," Richard Painter told host Brian Williams that Trump must be getting nervous after the reported immunity deal for the Trump Organization’s longtime Chief Financial Officer Allen Weisselberg.

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“Now we have the chief financial officer of the Trump Organization turning state’s evidence," Painter said. "I have to say that every white-collar criminal defense lawyer knows when the chief financial officer turns state’s evidence, everyone in the executive suite is in a lot of trouble because the chief financial officer knows exactly where the money is coming and going.”

“Remember, that every time Bob Mueller gets anywhere near Donald Trump‘s money, Donald Trump starts threatening to fire Bob Mueller," Painter continued.

"It appears that they’re closing in on the basic financial structure of the Trump Organization. Perhaps the reasons why he’s not disclosing his tax returns. And what we may find there is really quite ugly.”

Painter, who lost a bid for Minnesota's state Senate this month to incumbent Sen. Tina Smith Tina Flint SmithThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Credit union group to spend million on Senate, House races Health officials tell public to trust in science MORE (D-Minn.), is a frequent critic of the Trump administration and has predicted that Mueller's investigation will end in jail time over Trump campaign officials' alleged collusion with Russian intelligence.

"We're going to have people going to the slammer over this, the question is who, and how high up this is going to reach ... the notion there's no collusion is just ridiculous," he said in an interview in March.

Painter has also sharply criticized Trump over his rhetoric toward the press, telling The Hill in an interview in May that the president's rhetoric bore similarities to rhetoric used by Nazi leader Adolf Hitler.

“When he says ‘the fake news,’ ‘the lying press,’ you put that side by side with certain things Hitler said about the press,” Painter said. “It’s very scary rhetoric.”