MSNBC’s “Morning Joe” continued its daily attack on Donald Trump on Monday morning with Joe Scarborough nicknaming the GOP nominee “Amnesty Don,” while co-host Mika Brzezinski suggested Trump’s mental health should be examined.

#AmnestyDon became the No. 1 trending topic on Twitter after Scarborough’s comments.

“Think about this, for 14 months, Amnesty Don, and a lot of people are calling him Amnesty Don. People are saying it, they’re calling him Amnesty Don. Amnesty Don, that’s what people are calling him… I’m not calling him that, Amnesty Don. Hashtag #AmnestyDon,” Scarborough said, clearly mocking the way Trump often nicknames opponents.

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Scarborough went on to call Trump by the new nickname several times during the remainder of the show. Meanwhile, Brzezinski used airtime to essentially insist that Trump has mental issues.

“Let’s just take this seriously at this point — at other stages at other campaigns, a network might be snarky and get a psychologist out,” she said. “I actually think it’s time to hear from somebody in the mental health community to look at this person who’s been on television for months and give us a sense of what we have going on here. And, I’m sorry, let’s just not — let’s stop pretending we’re dealing with someone who we can completely understand. When you see somebody with problems, you know it. And there’s not anybody at this table who doesn’t think he has some sort of problem.”

Last week, Trump called the MSNBC morning show “unwatchable” in a series of harsh tweets directed at the MSNBC duo.

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Trump has a bizarre history with Scarborough and Brzezinski, who were so cozy with the GOP nominee during primary season that some people even speculated that Scarborough was angling for the vice presidential gig on Trump’s ticket. “Morning Joe” took Trump serious from the day he announced, and allowed Trump to frequently call in, often lobbing him softball questions.

Brzezinski and Scarborough were accused of turning a February MSNBC Town Hall with Trump into a “puff session” — and that was before audio leaked from a hot mic that captured the trio talking during commercial breaks.