Mika Brzezinski Mika Emilie BrzezinskiMika Brzezinski: 'Super grossed out' by Trump speech attendees 'who put their lives at risk' Trump hurls insults at Harris, Ocasio-Cortez and other women Trump targets 'Complete psycho' Scarborough, 'ditzy airhead' Brzezinski while praising 'Fox & Friends' MORE on Wednesday said President 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 “crossed another deeply disturbing line” with his tweet appearing to reference the death of a woman who worked for her MSNBC co-host, former Rep. Joe Scarborough Charles (Joe) Joseph ScarboroughScarborough calls on Cuomo to walk back statement he made about Trump: 'Out of bounds' Mika Brzezinski: 'Super grossed out' by Trump speech attendees 'who put their lives at risk' Democrats tear into Trump's 'deep state' tweet: His 'lies and recklessness' have 'killed people' MORE (R-Fla.), when he was a member of Congress.

“I’ll speak for Joe and myself here because Joe has stated that responding to President Trump’s tweets are a waste of his time. Today the president crossed another deeply disturbing line,” Brzezinski said in a statement obtained by New York Magazine.

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Her statement comes after Trump early Wednesday appeared to call for an investigation into the 2001 death of Lori Klausutis, who was an aide to Scarborough in Florida.

“And will they terminate low ratings Joe Scarborough based on the ‘unsolved mystery’ that took place in Florida years ago? Investigate!” Trump wrote on Twitter.

So now that Matt Lauer is gone when will the Fake News practitioners at NBC be terminating the contract of Phil Griffin? And will they terminate low ratings Joe Scarborough based on the “unsolved mystery” that took place in Florida years ago? Investigate! — Donald J. Trump (@realDonaldTrump) November 29, 2017

The St. Augustine Record in 2001 reported that Klausutis, who managed constituent services for Scarborough, died after falling unconscious and hitting her head due to a heart condition.

Brzezinski, who is also engaged to Scarborough, said Trump’s tweet pushed “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,” she added. “This is all we are going to be saying on the matter. We continue to focus on more pressing issues like the nuclear conflict with North Korea. We hope the president will do the same.”

The medical examiner said the aide was not aware of her heart condition.

"The head injury which represents the immediate cause of death was clearly as a result of an unprotected fall in a person who had lost consciousness or was losing consciousness from a probable cardiac arrhythmia,'' Dr. Michael Berkland said at the time, according to the newspaper.