If Michael Cohen's Testimony Is True, It 'Would Demand Trump Be Impeached and Convicted,' Says 'Art of the Deal' Co-author

Tony Schwartz, the man who wrote Donald Trump's best-selling book The Art of the Deal, said Michael Cohen's congressional testimony should spell the "end of the Trump presidency."

Speaking to CNN's Anderson Cooper before Cohen's appearance Wednesday before the House Committee on Oversight and Government Reform, Schwartz said it will be "historic" and bear a resemblance to the Watergate scandal.

"It kind of gives me a chill when I think I'm old enough, unfortunately, to have been there when John Dean testified before Congress, when Alexander Butterfield revealed that Nixon was doing tapes. This is that moment," Schwartz said, according to Mediate.

According to a report from The Wall Street Journal, the president's former lawyer is expected to accuse Trump of criminal conduct while in office in connection with the money paid to adult film star Stormy Daniels, real name Stephanie Clifford, to keep their alleged affair a secret in the run-up to the 2016 presidential election.

Cohen is also reportedly prepared to testify that Trump indirectly told him to lie about a potential Trump Tower project in Moscow that was negotiated during the 2016 campaign.

Cooper reminded Schwartz that despite the report from The Journal, it was still not confirmed what Cohen would say during his testimony, but that he did have "access to a lot of information."

Schwartz replied: "We already know that he's planning on accusing him of criminal activity, that he's going to accuse him of lying and cheating. So, what we know is that it's going to be an accusation that, if true, would demand that Trump be impeached and convicted.

"Now, that's a political calculation in the end. But on any legitimate grounds, if what Cohen says tomorrow is true, it should mean the end of the Trump presidency."

Cooper then said how the White House was already defending the president ahead of the public hearing, with press secretary Sarah Sanders describing Trump's former lawyer as a "disgraced felon" who is "going to prison for lying to Congress and making other false statements.

"Sadly, he will go before Congress this week and we can expect more of the same. It's laughable that anyone would take a convicted liar like Cohen at his word, and pathetic to see him given yet another opportunity to spread his lies," Sanders said in a statement.

Schwartz also noted that it was possible that Cohen Could be "lying again."

"We don't know for sure, but my strong guess is he's going to produce some pretty considerable documentary evidence that what he's saying is true.

"What's interesting for the Republicans and you can see it already, is that the only possible way to go here is to go after his credibility," Schwartz said.

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Michael Cohen, left, former lawyer to President Donald Trump, leaving federal court on August 21, 2018, in New York, and President Donald Trump, right, arriving to deliver remarks in the Rose Garden at the White House on February 15. "Art of the Deal" co-author Tony Schwartz believes Cohen’s testimony should mean the "end of the Trump presidency.” DON EMMERT,BRENDAN SMIALOWSKI/AFP/Getty Images