Jonathan Ernst / Reuters

Morning Joe cohosts Joe Scarborough and Mika Brzezinski said the president is "not mentally equipped" to watch their show in an op-ed published in the Washington Post Friday.

In the piece the pair talked about the president's "unhealthy obsession" with their morning show and mentioned how they were once threatened by senior White House officials with negative press coverage that would be published unless they asked the president to stop it.

"This year, top White House staff members warned that the National Enquirer was planning to publish a negative article about us unless we begged the president to have the story spiked. We ignored their desperate pleas," Scarborough and Brzezinski wrote.

Scarborough discussed this further during his appearance on Morning Joe Friday, prompting a response from Donald Trump, who said that the host had "called me to stop a National Enquirer article."

Scarborough responded with his own tweet, saying that the president had told "yet another lie."

He followed that up with another tweet asking the president, "Why do you keep lying about things that are so easily disproven? What is wrong with you?"

According to CNN's Brian Stelter, Scarborough told NBC executives about the threats as they were happening.

National Enquirer editor in chief Dylan Howard said in a statement that he did not "threaten either Joe or Mika or their children in connection with our reporting" on a story that ran in early June and that he did not know about any discussions between the White House and the hosts about that story.

At the beginning of June, we accurately reported a story that recounted the relationship between Joe Scarborough and Mika Brzezinski, the truth of which is not in dispute. At no time did we threaten either Joe or Mika or their children in connection with our reporting on the story. We have no knowledge of any discussions between the White House and Joe and Mika about our story, and absolutely no involvement in those discussions.

The TV duo, who are engaged to be married, said Trump's claims that they asked to join him in Mar-a-Lago three nights in a row is "false," as is a claim that Brzezinski was "bleeding badly from a face-lift."

The two were supposed to be on vacation from Morning Joe Friday but came on the show to discuss the president's Twitter rant.

"I'm fine," Brzezinski said, adding that her "family brought [her] up really tough."

In discussing what happened, Brzezinski said she's not worried about what President Trump is saying about her.

She went on to say that her father had just died, her mother has had two heart attacks, and that her daughter recently lost a friend, and that these are the things that she worries about.

Scarborough discussed the president's treatment of women, saying how he will insult Trump on air but "for some reason he always goes after Mika."

“He for some reason takes things so much more personally with women. He’s so much more vicious with women,” Scarborough said.

He went on to say that a "well-known congressman" once told him that the president went on a rant about Brzezinski in front a group of 20 members of Congress who were summoned to the White House to discuss the health care bill.

The congressman said that when Trump switched from talking about Scarborough to Brzezinski, "he was vicious."

"His face was red, he started talking about blood coming out of her ears, out of her eyes," Scarborough recalls the congressman saying. He said that the congressman then told him he was scared for the hosts.

"I've been in politics for decades and never seen anything like this," the congressman said, according to Scarborough.

In the Washington Post piece, Scarborough and Brzezinski also addressed the president's treatment of women.

"It is disturbing that the president of the United States keeps up his unrelenting assault on women. From his menstruation musings about Megyn Kelly, to his fat-shaming treatment of a former Miss Universe, to his braggadocio claims about grabbing women’s genitalia, the 45th president is setting the poorest of standards for our children," they wrote.

On Thursday, Trump fired off a tweet calling Brzezinski "low I.Q. Crazy Mika" and Scarborough "Psycho Joe."

He followed that up with another tweet that said that Brzezinski was bleeding from a face lift when he refused to see the couple at Mar-a-Lago around New Year's Eve.

The president's posts came after Thursday morning's show, during which Scarborough and Brzezinski discussed Trump's fake Time magazine cover that is hung at several of his golf resorts.

Scarborough poked fun at the fake cover with a spoof GQ cover of himself that the show created.

During this segment, Brzezinski said, “Nothing makes a man feel better than making a fake cover of a magazine about himself, lying every day, and destroying the country.”

She went on to say that in the photo, “he’s covering his hands because they’re teensy.”

On Friday, White House counselor Kellyanne Conway was on Good Morning America and wouldn't endorse what the president said on Twitter but did say she supports "the president’s right to fight back when he is being mercilessly attacked."

"I didn’t say I endorsed his attacks; I never said that," Conway said. "Bottom line I endorse his ability to connect on social media with Americans."

Several politicians spoke out Thursday against the president's comments including Republican Senator Lindsey Graham and House Speaker Paul Ryan.

Here's the entire segment from Friday's Morning Joe:

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