President's National Security Adviser Tests Positive For Coronavirus

Robert O'Brien, a high-ranking Trump administration official, tested positive for COVID-19. He likely contracted the virus from his daughter while spending time with family. The White House confirmed his diagnosis, stating he has mild symptoms and is self-isolating. There is no risk to President Trump or Vice President Pence, and the National Security Council's work continues. President Trump acknowledged O'Brien's positive test but mentioned he hadn't seen him recently.

What measures has Robert O'Brien taken following his diagnosis?

What did President Trump say regarding Robert O'Brien's positive test?