President Donald Trump's national security adviser plans to brief reporters at the White House.

The White House says H.R. McMaster will hold an on-camera briefing before noon. He was originally scheduled to appear with press secretary Sean Spicer, but Spicer plans to hold a separate, off-camera session with reporters later in the day, after McMaster's appearance.

Reporters had been promised a briefing from McMaster about Trump's first overseas trip, which opens Friday. But McMaster is likely to face questions about reports that Trump shared classified intelligence information with Russian officials when they met in the Oval Office last week.

McMaster has denied the reports, telling reporters Monday after the story broke: "I was in the room. It didn't happen."