The man who co-authored Donald Trump’s signature book issued a stern warning about the president’s mental health.

Tony Schwartz, who co-wrote 1987′s The Art of the Deal with the future president, called Trump “delusional” in an interview with CNN’s Anderson Cooper.

He also asked if Trump is “crazy like a fox or just crazy,” then answered his own question:

“I think the overwhelming weight of evidence suggests that he’s just crazy. And not crazy, causal crazy. I’m talking about crazy ― I’m not a psychiatrist, so I actually can get away with saying this ― but crazy as a personality disorder.”

“Simple answer is, he says whatever he thinks serves him,” Schwartz said. “And while he’s saying it, he does believe it.”

The full interview is posted online on Mediaite.

Schwartz has been predicting that Trump will ultimately resign but declare “victory” as he leaves office.

“I surely believe that at some point over the next period of time he’s going to have to figure out a way to resign,” Schwartz told CNN in May.

Schwartz advised the Hillary Clinton presidential campaign for free last year, calling it “my penance for having created a man who has become a monster.”

He has also said he would donate his share of the profits from The Art of the Deal to the National Immigration Law Center, an organization that helps low-income immigrants.

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With few legislative accomplishments under his belt, President Donald Trump has repeatedly turned to executive orders ― a tool once maligned by Republicans ― to undo much of former President Barack Obama’s regulatory legacy. While some have been consequential ― like approving the construction of the Keystone XL pipeline ― many of Trump’s orders have been symbolic, like one minimizing the “burden” of Obamacare regulations.



Trump appears to enjoy the act of signing executive orders and bills more than any of his recent predecessors. While other presidents have also ceremoniously signed documents, Trump regularly holds up his work for photo opportunities.

Trump signs an executive order entitled "Comprehensive Plan for Reorganizing the Executive Branch" on March 13, 2017.

Trump shows the signed executive order supporting black colleges and universities in the Oval Office of the White House on Feb. 28, 2017.

Trump, flanked by business leaders, signs an executive order establishing regulatory reform officers and task forces in U.S. agencies on Feb. 24, 2017.

Trump holds up a signed executive order entitled "Preventing Violence Against Federal, State, Tribal and Local Law Enforcement Officers" in the Oval Office on Feb. 9, 2017.

Trump signs executive orders, including one to roll back financial regulations of the Obama era, on Feb. 3, 2017.

Trump holds up signed executive orders in the Hall of Heroes at the Department of Defense in Arlington, Virginia, on Jan. 27, 2017.

Trump holds up a signed executive order at the Department of Homeland Security on Jan. 25, 2017.

Trump displays one of five executive orders he signed related to the oil pipeline industry for a photograph in the Oval Office on Jan. 24, 2017.

Trump holds an executive order titled "Mexico City Policy," which bans federal funds going to overseas organizations that perform abortions, on Jan. 23, 2017.

Trump has also gotten the opportunity to sign several bills into law that revoked a number of Obama-era regulatory measures. In March, Trump he signed H.J. Res 37, which rescinded a rule requiring prospective federal contractors to disclose their labor violations, during a ceremony in the Roosevelt Room of the White House.

Trump signed a bill authorizing funding for NASA in a bill signing ceremony as NASA astronaut Tracy Caldwell Dyson (4th L) and legislators including Rep. Brian Babin (R-Texas) (L), and Rep. John Culberson (R-Texas) (2nd L) looked on in the Oval Office.

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This article originally appeared on HuffPost.