The former 'Late Show' host tells Tom Brokaw: "I'm happy for the guys [late-night hosts] — men and women — there should be more women."

David Letterman hosted a late-night talk show for 33 years, but now, he says, he isn't all that interested in what's going on in the late-night landscape.

"I couldn't care less about late-night television," he says in an interview with Tom Brokaw for NBC News' On Assignment, a limited series from Dateline NBC, airing Sunday at 7 p.m. ET/PT. "I'm happy for the guys — men and women — there should be more women."

He also reiterates recent comments that he thinks CBS should have selected a female to host his former talker, Late Show, which is now hosted by Stephen Colbert.

"I don't know why they didn't give my show to a woman," says Letterman. "That would have been fine. You know, I'm happy for their success. And they're doing things I couldn't do. So that's great."

Still, he doesn't miss the daily grind.

"It's interesting. I thought for sure I would," he says. "And then, the first day of Stephen's show when he went on the air — an energy left me and I felt like, ‘You know, that's not my problem anymore.’ And I've kind of felt that way ever since. I devoted so much time to the damage of other aspects of my life. The concentrated, fixated, focusing on that — it's good now to not have that."

Letterman also reiterated that he wasn't consulted on his replacement.

"No, they didn't ask me about anything," he says. "They were just -— they were just happy I was going," he adds, laughing.

The interview, which took place in Letterman's hometown of Indianapolis over Memorial Day weekend, is being billed as his "first in-depth TV interview since leaving his show." Letterman also talks to Brokaw about Donald Trump and shares memories of Johnny Carson. (NBC News has not released quotes from other portions of the interview.)

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