U.S. Department of Justice/Getty Images The man accused of firing shots at the White House Correspondents' Association dinner is pleading not guilty. Cole Tomas Allen, who was arrested during the event and armed with guns and knives, entered a not guilty plea on Monday (May 11) while being charged with the alleged attempted assassination of President Donald Trump, plus two federal gun charges. The two federal gun charges are interstate transportation of weapons and discharge of a firearm during a violent crime.