July 27, 2020 | 9:25am

National security adviser Robert O’Brien has tested positive for the coronavirus, according to a report.

O’Brien has been out of the office since late last week, a person familiar with his situation told Bloomberg News.

He came down with COVID-19 after a family event and has been isolating at home while still running the National Security Council, mostly by phone, according to one of the sources cited by the outlet.

The sources asked Bloomberg not to be named to discuss information that has not yet been made public.

O’Brien is the closest official to President Trump to develop the illness, as the pandemic continues to surge with infections and deaths on the rise in many states.