WATCH: National Security Adviser McMaster holds emergency press conference to address Trump intel disclosures
Newly named National Security Adviser Army Lt. Gen. H.R. McMaster listens as U.S. President Donald Trump makes the announcement at his Mar-a-Lago estate in Palm Beach, Florida U.S. February 20, 2017. REUTERS/Kevin Lamarque

National Security Adviser H.R. McMaster is slated to hold an emergency press conference to address the revelation that President Donald Trump shared classified US intelligence with Russian officials in the Oval Office.

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