Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE tweeted out his latest attack on MSNBC's "Morning Joe" co-host Mika Brzezinski on Friday, calling her “crazy and very dumb” and saying she had a breakdown on air.

Trump wrote on Twitter that he had heard that Brzezinski “had a mental breakdown while talking about me."

“Joe [Scarborough] a mess!” he added.

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Just heard that crazy and very dumb @morningmika had a mental breakdown while talking about me on the low ratings @Morning_Joe. Joe a mess! — Donald J. Trump (@realDonaldTrump) September 2, 2016

The “Morning Joe” hosts have been increasingly critical of the GOP presidential nominee in recent weeks.

Scarborough has repeatedly mocked Trump by calling him “Amnesty Don” when it was rumored that he would be mitigating his hard-line immigration stance. On Wednesday, Scarborough released a music video, singing of Trump's "premature softening" on the issue.

Trump has focused much of his return ire on Brzezinkski, tweeting last week that she was "a neurotic and not very bright mess!" He also implied a romantic relationship between Brzezinkski and Scarborough.