 Secret Service Director Kimberly Cheadle goes before the House Oversight Committee today. She's expected to be pressed by lawmakers about security failures at an outdoor rally in Butler, Pennsylvania, where a gunman tried to assassinate former President Donald Trump. A bullet grazed Trump's right ear. One attendee was killed. Two others were wounded. In prepared remarks, Cheadle says the agency failed on July 13th, and she takes full responsibility for any security lapse.