United Kingdom, Nov. 26 -- David Letterman has "never been more proud" of Seth Meyers.

The veteran broadcaster admitted he has enjoyed seeing his Late Night successor take on US President Donald Trump - who recently called for NBC to "immediately" fire the 51-year-old comic - but warned him "things" could "happen" if he isn't careful.

Speaking on The Barbara Gaines Show, David showed a message of support for "out good friend" Seth.

he said: "The president of the United States now wants to fire Seth Meyers. And I thought, 'This is just delightful. How do you think that's going to go?

"So anyway, I've never been more proud of Seth Meyers.

"That's our old show, as a matter of fact. We used to do that show, and he does a magical job. But...