 When an event like this is held, the Secret Service sends out, they do a site survey. Where's the venue? What are the parameters of who can get in? How's access going to be controlled? What screening process are you going to do? And then once you've secured the venue, he says, and figured out all the entrances and exits and how to cover those and prevent anyone from getting in then that should not be there to control access, you do a sweep outside.