US President Donald Trump has ridiculed the looks and temperament of a female cable television host whose show he says he has stopped watching.
In a series of tweets this morning, the president went after Mika Brzezinski and Joe Scarborough, who have criticised Mr Trump on their MSNBC show Morning Joe.
He wrote: "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".
That was a dig at Mr Trump, who has long been sensitive about the size of his hands.
"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.
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.
About 15 minutes before the president himself tweeted, White House social media director Dan Scavino similarly attacked the hosts.
"#DumbAsARockMika and lover #JealousJoe are lost, confused & saddened since @POTUS @realDonaldTrump stopped returning their calls! Unhinged," he wrote on his personal account.
Mr Trump was correct that the MSNBC hosts spent time at the president's Florida resort, a visit that Mr Scarborough said was to arrange an interview with Mr Trump.