Chansley, who is also known as Jake Angeli, was also indicted on four misdemeanor counts.
Prosecutors say Chansley, a well-known fixture at Arizona pro-Trump rallies, is a "self-proclaimed leader" in the QAnon conspiracy theory movement.
Images of a shirtless Chansley storming the Capitol wearing horns, a fur coyote tail headdress and face paint, carrying a bullhorn and a spear, quickly went viral on social media.
"Chansley also used his bullhorn to communicate that they were there to take out several United States congressmen," the filing says.
The memorandum also says "while officer Robishaw was attempting to quell the crowd, Chansley was using his bullhorn to incite it.".
Hundreds more charges are expected as federal investigators comb tips, video and social media to identify and arrest suspects across the country.
A team of senior federal prosecutors are investigating more serious charges including sedition and conspiracy related to the "most heinous" acts at the Capitol, Sherwin said Tuesday. »