There was no immediate explanation from the White House.
The Associated Press and Time magazine boycotted the briefing because of how it was handled. The White House Correspondents Association is protesting.
The conservative media organizations Breitbart News, The Washington Times and One America News Network were allowed in.
Hours earlier, at the Conservative Political Action Conference outside Washington, President Trump mocked and disparaged the news media. He said that much of the press represents “the enemy of the people.”
“They are the enemy of the people because they have no sources,” Trump said. “They just make them up when there are none.”
He also said reporters “shouldn’t be allowed” to use unnamed sources.