Media groups have reacted angrily after several, including the BBC, were barred from an informal briefing with White House Press Secretary Sean Spicer.
The excluded New York Times said the move was “an unmistakable insult to democratic ideals”.
The bar came hours after President Donald Trump delivered another attack on the media, saying that “fake news” was the “enemy of the people”.
The BBC has asked the White House to clarify its exclusion.
BBC bureau chief in Washington, Paul Danahar, said: “We understand that there may be occasions when, due to space or circumstances, the White House restricts press events to the established pool. However, what happened today did not fit into that pattern.”
He added: “Our reporting will remain fair and impartial, regardless.”
Friday’s briefing had been scheduled as an on-camera event in the briefing room but was changed to an informal off-camera event, known as a “gaggle”, in Mr Spicer’s office.
Explaining the move to go off-camera, he said: “We don’t generally do, we haven’t done briefings when the president’s had a major event.”
White House Correspondents’ Association President Jeff Mason said it was “protesting strongly”.
The BBC, CNN, the New York Times, the Guardian, the Los Angeles Times, Buzzfeed, the Daily Mail and Politico were among those excluded.
Those allowed into the room included ABC, Fox News, Breitbart News, Reuters and the Washington Times.
The Associated Press, USA Today and Time magazine refused to attend as a protest against the move.
Both the Washington Post and McClatchy said they were unaware of the exclusions at the time and that had they known, their reporters would not have attended the gaggle.
Both said they would not participate in future briefings if the exclusions continued.
When asked at the gaggle, Mr Spicer denied CNN and the New York Times had been denied access because the White House was unhappy with their coverage.
But he said: “We are just not going to sit back and let false narratives, false stories, inaccurate facts get out there.”
CNN anchor Jake Tapper said the exclusion was “not acceptable, in fact it’s petulant. And indicative of a lack of basic understanding of how an adult White House functions”.
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