"I will not be attending the White House Correspondents' Association Dinner this year. Please wish everyone well and have a great evening!" Trump tweeted on Saturday.
The black-tie dinner, which raises money for journalism scholarships, takes place every spring and is usually attended by the president, journalists, celebrities and Washington insiders. The last president to miss the dinner was Ronald Reagan, who sat out because he was recovering from an assassination attempt in 1981, although he still delivered remarks by phone.
Several news organizations had already withdrawn from the April 29 event in protest of Trump's treatment of the media.
Vanity Fair and Bloomberg, which usually co-host an exclusive, star-studded after-party, have canceled that gala, while The New Yorker similarly canceled its pre-party April 28, CNN reported.
Most other news organizations, including CNN, have yet to announce their official plans for the weekend. But some are said to be rethinking their attendance in the wake of the White House's decision to block CNN, The New York Times and other outlets from an off-camera White House press briefing on Friday.
White House Correspondents Association President Jeff Mason told CNN's Brianna Keilar on Saturday that Trump's decision is not surprising given the negative things the President has said about the media, such as suggesting they are "the enemy of the American people."
"That of course is something that the correspondents' association and journalists reject," Mason said. "The media is an incredibly important part of a vibrant republic, and we celebrate that at that dinner.
"It's up to him to decide whether or not he wants to come," he said. "But the correspondents' association and the members who work in this room every day will continue to do our job and write the news and tell the truth about this administration, as we have done about every administration before."