The chief of the Secret Service said at a press briefing Friday that agents on the ground in Butler, Penn. did not know Thomas Crooks had a weapon until he fired his first shot at former President Donald Trump from the roof of a nearby building on July 13. Acting Director Ronald Rowe Jr. said the agency took "full responsibility" for the law enforcement failings that day, when one of the bullets fired by Crooks grazed Trump's ear and nearly took his life. Corey Comperatore, a former volunteer fire chief from Pennsylvania, was killed in the gunfire. Also injured in...