Later Wednesday, the president of the White House Correspondents Association said in a statement that if Trump were to carry out his threat, it would be "an unconscionable assault on the First Amendment".
So where did Trump get 91 percent?
The president's morning Twitter rant admitted that "Fake News" doesn't mean faulty reporting or satire from The Onion, but simply refers to things he considers negative. Why do we work so hard in working with the media when it is corrupt?
Those numbers only take a look at ABC, CBS, and NBC, and thus do not include the positive press Trump receives from Fox.
This time, the group examined all 1,065 network evening news stories about Mr. Trump and top members of his administration during the first four months of this year.
The MRC had looked at broadcast evening news reports of Trump from January 1 through April 30 and "found 90 percent of the evaluative comments about the president were negative".
President Donald Trump and Nigeria's President Muhammadu Buhari shake hands as they hold a press conference in the Rose Garden of the White House in Washington, DC, April 30, 2018.
Percentage-point difference aside, that's not the first time the center has found a shockingly large percentage of negative news aimed at the president.
Trump's tweet was the second shot at the media in as many days from the White House.