Trump's national security adviser 'tests positive for Covid-19'

President Donald Trump's national security adviser, Robert O'Brien, has tested positive for coronavirus, sources have told US media.

Mr O'Brien, 54, has reportedly been self-isolating and working from home, the sources said, reports BBC.

He would be the highest-ranking official in Mr Trump's administration known to have tested positive.

It is not clear when the two last met, but they appeared together two weeks ago on a trip to Miami.

One source told Bloomberg that Mr O'Brien had been out of his office for a week and that the adviser had contracted the virus after a family event.

He is still running the National Security Council, mostly by phone, Bloomberg reports.

Anyone near the president is tested regularly for Covid-19.