Cole Tomas Allen, accused of storming the White House Correspondents' Dinner armed with a shotgun, a handgun, and three knives, appeared in court on Saturday.
He has been charged with attempting to assassinate President Donald Trump and two firearms offenses.
BBC News correspondent Shaimaa Khalil reports on what happened inside the courtroom.
Allen's arrest came after he forced his way into the event, causing chaos and panic among attendees. The charges carry severe penalties if convicted.