Four times in recent weeks, members of the White House press corps have relayed questions to press secretary Jen Psaki from someone claiming to be a fellow reporter who was not able to be there in the room due to Covid protocols. That colleague, who goes by the name Kacey Montagu, doesn’t exist — at least not as an actual reporter. Since late last year, Montagu has taken on the identity of a White House correspondent extraordinaire with a fictional outlet to boot: White House News, shortened in emails to WHN. Montagu started two real-life Twitter handles, which are followed...