David Letterman admits he stayed on television for far too long during an appearance on Thursday’s “The Ellen DeGeneres Show”.

Letterman, 71, who announced his retirement from the “Late Show” back in 2014, tells the host after saying he should have taken a step back years ago: “Yes it is true, and I’ll tell you what happened.

“It turns out nobody had the guts to fire me. And I should have left like 10 years ago. You want to make sure you have some energy to direct toward other things.”

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After praising DeGeneres for doing many other things alongside her talk-show, Letterman adds: “I did not. All I cared about was myself. I was looking through the wrong end of the telescope.”

It’s now been four years since Letterman stepped away from his show, with him since making a return to TV to host Netflix’s “My Next Guest Needs No Introduction”.

Letterman’s interview also sees him play a game of “Burning Questions”, with one of the questions asking the star what he’d say to Donald Trump if he were to interview him again.

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The host shares, “I knew President Trump. I’m disappointed in his administration.

“I would say to him, ‘Don, why are you such a putz?'”