Article continues below advertisementCole Tomas Allen, the man accused of trying to assassinate Donald Trump at the April 25 White House Correspondents' Dinner, pleaded not guilty on the morning of Monday, May 11.Allen, who did not speak in court and was seen wearing shackles around his wrists, was hit with four felony charges: attempt to assassinate the President of the United States, assaulting an officer of the United States with a deadly weapon, transportation of a firearm and discharging a firearm during a crime of violence.He could face life in prison if convicted.