WASHINGTON — After refusing to attend next weekend’s annual White House Correspondents’ Association dinner — a traditional night of comity between presidents and the news media — President Trump announced Saturday that he would hold a rally away from the capital while the dinner was underway.

In a Twitter message on Saturday morning, the president said he would be “holding a BIG rally in Pennsylvania” on April 29, the same night the press corps will be gathering for its annual black-tie event at the Washington Hilton.

Mr. Trump’s decision is another thumb in the eye to the White House press corps after months of tension and acrimony between the president and the reporters who cover him. Mr. Trump has called several news organizations “fake” or the “enemy of the people” and has repeatedly said The New York Times is “failing.”

After the president announced in February that he would not attend the dinner, the White House indicated that none of his staff members would attend, “in solidarity” with their boss — a move that was widely interpreted as an order by Mr. Trump that they should not go.