O'Brien is the highest ranking White House official and the closest to President Trump known to test positive for the virus. He reportedly came down with the virus after a family event and has been working at home since late last week. He had recently been in Europe, meeting with officials in the U.K., France, Germany, and Italy, CNN notes.
O'Brien, senior National Security Council staff, and other people close to Trump are tested daily for COVID-19. The U.S. has so far seen 4 million of the world's 16 million coronavirus cases and about 149,000 of its nearly 650,000 deaths.
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