On Wednesday, U.S. President Donald Trump thanked QAnon conspiracy theorists for their support. This follows his move last week to publicly back a QAnon supporter who just won a Republican primary run-off in Georgia. The endorsement drew widespread criticism because QAnon is a baseless conspiracy theory built on an unfounded belief about a deep state group of elites who exploit children and are united against Trump.

Kevin Roose is a tech columnist for the New York Times and host of the podcast Rabbit Hole. Today he explains why QAnon is a dangerous source of misinformation with the makings of a national security threat.