Left-wing activist charged in Capitol riot after saying he was just there to 'document'

A left-wing activist who told Fox News last week that he’d followed a pro-Trump mob into the Capitol in order to "document" the siege is now the subject of a criminal complaint in connection with his alleged participation, according to the U.S. Justice Department.

John Sullivan can allegedly be heard egging on protesters in video he provided to the FBI, according to a federal criminal complaint. He has also shared the video to his YouTube and Twitter accounts under the pseudonym Jayden X.

He was charged Thursday in federal court in Washington after being arrested by the FBI. He remains in custody in Toeele County, in his home state of Utah, on a U.S. Marshals Service hold request.

James Sullivan, the man’s brother, told Fox 13 News that he gave tips about his brother to the Salt Lake City FBI. James Sullivan said he found out that his brother was at the Capitol when friends posted pictures online.