US President Donald Trump's national security adviser Robert O'Brien has tested positive for the novel coronavirus, a source familiar with the situation has said.
The White House confirmed staff is regularly tested for the virus, and Mr O'Brien is the most senior official to be found positive amid the pandemic.
Mr O'Brien has been isolating at home and working remotely after apparently contracting the virus at a family event, Bloomberg earlier reported citing unnamed sources.
Politico separately reported it was unclear how he was exposed to the virus or how much contact he had recently with the President in person.