David Letterman in a new Vulture interview weighs in on President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE and the jokes he could’ve made about "Trumpy" if he still hosted "The Late Show."

When asked how he feels about the late-night shows becoming social media sensations, Letterman called them useful while adding he didn’t know how to do it.

“But the idea of Twitter: Trumpy — my son, Harry, and I call him 'Trumpy' — has really got something with it. Rather than a laughable expression of ego run amok, it could be a useful tool,” Letterman said.

“If we get a president sometime soon who does not have a mental disorder, Twitter will be useful,” Letterman added.

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Letterman also said Trump’s feud with civil rights icon Rep. John Lewis (D-Ga.) “broke” his heart.

“He’s ignorant in a way that’s insulting to the office, insulting to America, insulting to human rights, insulting to civil rights, insulting to John Lewis. Trump saying that broke my heart. I thought, ‘You stupid son of a bitch. You ought to have known better than that,’” Letterman said.

Lewis received a skull fracture while marching in a peaceful protest across the Edmund Pettus Bridge in 1965, a day that is remembered as “Bloody Sunday.”

“Lewis goes down there and gets a goddamned skull fracture. I mean, Trumpy will never have to worry about a skull fracture because of the hair,” Letterman said.

“How do you know if Donald Trump is lying? His lips are moving,” Letterman added.

Letterman also joked that if he still had a show, his team would’ve had to “drag” him off stage because he’d have so many things to say about Trump.

“[P]eople would have to come and take me off the stage. ‘Dave, that’s enough about Trump. We’ve run out of tape,’” Letterman said.

Letterman hosted "The Late Show” for 33 years before handing it over to current host Stephen Colbert.