The MSNBC hosts Joe Scarborough and Mika Brzezinski railed against President Donald Trump on Thursday, calling him “mentally unstable” and suggesting he is unfit to serve.

On Wednesday, Trump promoted an unfounded conspiracy theory that Scarborough was involved in the 2001 death of an intern in his congressional office.

In a fiery “Morning Joe” segment on Thursday, the MSNBC hosts Joe Scarborough and Mika Brzezinski accused President Donald Trump of being “mentally unstable” a day after Trump promoted an unfounded conspiracy theory that Scarborough was involved in the 2001 death of an intern in his congressional office.

The two media personalities, who used to be friendly with Trump and regularly interviewed him during the first months of his 2016 presidential campaign, called on his Cabinet officials to stand up to him.

“I’m just kind of wondering, what’s the Cabinet waiting for?” Scarborough said. “What are Republicans in the House and Senate – because it’s never going to get more deadly serious than it is now.”

Scarborough called the president “completely detached from reality” and later claimed that “everybody around Donald Trump knows he’s not stable.”

“We are facing a showdown with a nuclear power, and you have somebody inside the White House that the New York Daily News says is mentally unfit, that people close to him say is mentally unfit, that people close to him during the campaign told me had early stages of dementia,” Scarborough said.

“When are we supposed to say this?” he continued. “After the first nuclear missile goes? Is that when it’s proper to bring this up in polite society?”

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During the Thursday segment, Brzezinski read from a New York Daily News editorial published Wednesday that called Trump a “madman.”

“Only those completely under his spell can deny what growing numbers of Americans have long suspected: The president of the United States is profoundly unstable,” the editorial said. “He is mad. He is, by any honest layman’s definition, mentally unwell.”

In a Wednesday tweet, Trump called for Scarborough – as well as MSNBC’s president, Phil Griffin – to be fired, citing an unfounded conspiracy theory that Scarborough was somehow implicated in the death of an intern in his congressional office in 2001, when he was a US representative from Florida.

A medical examiner at the time determined that the staffer, 28-year-old Lori Klausutis, had an undiagnosed heart condition that caused her to lose consciousness, collapse, and hit her head on a desk in Scarborough’s district office, resulting in a fatal blood clot. Her death was ruled an accident.

Scarborough responded to Trump’s tweet on Wednesday, saying the president was “not well.” Brzezinski called Trump’s tweet a violation of “basic moral judgment” in a statement.

“Today the president crossed another deeply disturbing line,” Brzezinski’s statement said. “With his attack on Joe this morning, the chief law enforcement officer of the United States of America advanced a false conspiracy theory to intimidate the press and cause a chilling effect on the 1st Amendment. Joe and I are not intimidated and his bizarre behavior contravenes both the Constitution and basic moral judgment.”

A New York Times report on Tuesday described sources as saying Trump had continued to publicly and privately entertain conspiracy theories, including the long-debunked claim that former President Barack Obama was not born in the US. Trump also continues to falsely claim that undocumented immigrants helped Hillary Clinton win the popular vote in the 2016 presidential election, the report said.

Another Times report published over the weekend said Trump had suggested the 2005 “Access Hollywood” tape in which he boasted about groping women isn’t real – though Trump publicly acknowledged its authenticity during the presidential campaign.