David Letterman says 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 has morphed from being the "boob of New York" to a "soulless bastard” in the White House.

The former CBS "Late Show" host recalled having Trump as a guest on his program more than 30 times, during an interview with The Hollywood Reporter's "Awards Chatter" podcast released Tuesday.

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"I think he just liked being on TV," Letterman said. "He could take a punch, and then I would talk about him evicting elderly widows, and being a slum lord, and making fun of his hair."

"I had no sense that he was the soulless bastard that he's turned into. Because then, he would laugh at himself," Letterman said.

Letterman, 72, said he's mystified by what he described as Trump's transformation.

"[Trump] used to be kind of like the boob of New York that pretended to be wealthy, or we thought was wealthy, and now he's just a psychotic," Letterman said.

"Is that putting too fine a point on it?" he added.

Letterman, now host of Netflix's "My Next Guest Needs No Introduction," said he's often asked if he'd like to talk to Trump now that he's the commander in chief.

"And I would. I would just like to say, 'Don, it's Dave. Remember me? I want to talk to the real Donald Trump.' Because I now don't know which is the real Donald Trump. And if the Donald Trump that I was talking to [then] was the real Donald Trump, how do you get to be the guy he is now?"

"Politics notwithstanding — let's just say everything is great and he's done a great job, but he still behaves the way he behaves — who behaves like that?"

Letterman, who stepped down from "The Late Show" in 2015, is a frequent critic of Trump who's previously called the president a "goon" and "ignorant."