WASHINGTON • David Letterman has been off the Late Show for nearly two years and during that time, he has apparently been bursting to offer his opinion on a few topics, especially his old friend "Trumpy".
He got the chance with a wideranging New York Magazine interview, during which he talked - and talked and talked - about everything from the United States President's Twitter habits to Jimmy Fallon's infamous hair-mussing interview to the line of questioning he would use on Mr Trump if he had the chance.
The former late-night host, 69, who still sports that impressively bushy retirement beard, had a lot to say. "I'm afraid something has happened to me hormonally," he explained. "I can't stop talking."
He and Mr Trump have some history, given that Mr Trump was on Letterman's show a number of times and the late-night host loved to needle the businessman.
During a 2012 interview, Letterman put Mr Trump in the hot seat by pointing out that a lot of the Trump brand clothing is made in China - a country Mr Trump had just been complaining about, saying it would inevitably surpass the US as the world economic leader. The clip made it into a Hillary Clinton campaign ad.
In the New York interview, Letterman talked about how he shied away from politics during his early years. He was taking a cue from Johnny Carson, the Tonight Show host who vowed never to talk about Vietnam, he explained. But then Jon Stewart came along. "He made it so that not doing political stuff got to be the elephant in the room," Letterman said.
Around the same time, politics was becoming low-hanging fruit for comedians, especially with the revelations about Monica Lewinsky and former president Bill Clinton.
These days, Letterman thinks late-night hosts have an obligation to take on Mr Trump, though he did not go so far as to throw the current Tonight Show host under the bus.
"I don't want to criticise Jimmy Fallon, but I can only tell you what I would have done in that situation: I would have gone to work on Mr Trump," Letterman said.
How so? "I would just start with a list," he said. "'You did this. You did that. Don't you feel stupid for having done that, Don? And who's this goon Steve Bannon and why do you want a white supremacist as one of your advisers? Come on, Don, we both know you're lying. Now, stop it.'"
He added: "I think I would be in the position to give him a bit of a scolding and he would have to sit there and take it. Yeah, I would like an hour with Donald Trump; an hour and a half."
The comedian was particularly irked by the way the President attacked civil rights activist Representative John Lewis on Twitter.
"In addition to every other thing that's wrong with Trump, 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," Letterman rattled off. "Trump saying that broke my heart. I thought... 'You ought to have known better than that.'"
The former talk-show host may be fired up, but fans should not get their hopes up for a return to television. He insists he does not have any interest in returning to late night. Besides, Seth Meyers and Stephen Colbert are doing the work of speaking truth to power. Not that Letterman would know. He does not even watch any of the shows.
After 30 years in the business, he is just over it. Plus, he admitted, "the truth is I can't stay up that late".