 Tamara Keith, NPR News. The head of the Secret Service, Kimberly Cheadle, is testifying on Capitol Hill about the security lapses that allowed a gunman to attempt to assassinate former President Donald Trump over a week ago at a Pennsylvania rally. One spectator died. Two others were wounded. Trump sustained an ear injury. The Secret Service's solemn mission is to protect our nation's leaders. On July 13th, we failed. As a director of the United States Secret Service...