 Nikki Haley is expected to speak today. The investigation of the assassination attempt by 20-year-old Thomas Matthew Crooks is already pointing to serious security flaws. CBS's Jared Hill. CBS News has learned Secret Service did not sweep the building Crooks shot from, despite it having a direct line of sight to the stage since it was outside of the security perimeter. The Butler County Sheriff says his department wasn't responsible for clearing the roof either. I don't know whose responsibility that would have been.