The dinner attracts politicians, journalists and celebrities and is typically attended by the president, who's often roasted.
Trump isn't saying why he won't be there. He has railed against "the fake news media," saying it is "the enemy of the American people."
Spokeswoman Sarah Huckabee Sanders says it's "kind of naive of us to think that we can all walk into a room for a couple of hours and pretend that some of that tension isn't there."