Cole Allen charged in Trump assassination attempt in first court appearance after WHCA Dinner shooting

Allen appeared in federal court Monday wearing a blue prison jumpsuit to face charges of attempting to assassinate the President of the United States, discharge of a firearm during a crime of violence and transporting a firearm across state lines, according to the Department of Justice. 

He has not yet entered a plea and will remain in custody.

Monday's court appearance is separate from Cole's arraignment, with the judge scheduling a detention hearing for April 30 and a preliminary hearing for May 11. 

"Cole Allen's journey of accountability in the criminal justice system starts today," U.S. Attorney Jeanine Pirro said in a press conference Monday afternoon, adding, "There will be additional charges as this investigation continues to unfold."

One Secret Service agent was struck by gunfire in a ballistic vest, and Allen was subsequently tackled by officers and taken into custody. 

Approximately one hour later, Trump announced that law enforcement had asked attendees to evacuate the building, which was consistent with protocol, adding the event would be rescheduled within 30 days.

Allen faces the possibility of life in prison if convicted on the attempted assassination charge, with the two firearms charges carrying a maximum sentence of up to 10 years in federal prison. 

"Let this be a message to anyone who thinks that Washington, D.C., is the place to act out political violence," Pirro told reporters Monday. "And if you are willing to do so with a firearm and cross state lines, we will find you. We will track your steps from the inception of your plan, and we will prosecute you to the fullest extent of the law."