No email was sent out informing NSC staff that their boss, Robert O'Brien, had tested positive for coronavirus. He abruptly left the office last Thursday. Some found out from press reports (!), @vmsalama and I are told.
Trump's national security adviser tests positive for Covid-19
President Donald Trump's national security adviser, Robert O'Brien, has tested positive for Covid-19, according to an official familiar with what happened.
cnn.com
9:53 AM · Jul 27, 2020