 NPR's Giles Snyder says the head of the Secret Service is expected to testify on Capitol Hill next week about what went wrong with security at the rally. Secret Service Director Kim Cheeto seems ready to be held accountable for the security failures that led to multiple shots being fired at the stage in Butler, Pennsylvania, leaving one person dead, two others critically wounded and grazing Donald Trump's ear. Cheeto told ABC News that what happened was unacceptable, and she agreed that the buck stops with her.