President Donald Trump ridiculed the looks and temperament of a female cable television host whose show he says he has stopped watching.

In a series of tweets Thursday morning, the President went after Mika Brzezinski and Joe Scarborough, who have criticized him on their MSNBC show “Morning Joe.”

“I heard poorly rated Morning Joe speaks badly of me (don’t watch anymore). Then how come low I.Q. Crazy Mika, along with Psycho Joe, came ... to Mar-a-Lago 3 nights in a row around New Year’s Eve, and insisted on joining me. She was bleeding badly from a face-lift. I said no!”

Ms. Brzezinski responded on Twitter by posting a photograph of a Cheerios box that has the phrase “made for little hands.” Critics looking to get under the President’s skin have long suggested that his hands appear smaller than usual for his frame.

“It’s a sad day for America when the President spends his time bullying, lying and spewing petty personal attacks instead of doing his job,” NBC News spokeswoman Lorie Acio said in a statement.

The White House did not immediately respond to questions about the tweets, including what it was that set the President off.

About two hours before the President’s tweets, Brzezinski said on the show that “it’s not normal behavior” for any leader to be tweeting about people’s appearances, bullying, lying, undermining managers and throwing people under the bus.

Saying that if any business executive behaved the way Mr. Trump does, “There would be concern that perhaps the person who runs the company is out of his mind.”

On their Wednesday show, Ms. Brzezinski and Mr. Scarborough roundly mocked Mr. Trump for displaying in several of his golf resorts a fake Time Magazine cover featuring himself.

“That’s needy,” Ms. Brzezinski said on the show.