 This is an event that should have never happened. Who is most responsible for this happening? What I would say is that the Secret Service is responsible for the protection of the former president. So the buck stops with you? The buck stops with me. I am the director of the Secret Service. It was unacceptable, and it's something that shouldn't happen again. Minutes after Trump took the stage Saturday in front of thousands of people, gunman Thomas Matthew Cook's wounding the former president and three others before a Secret Service counter sniper took him out.