 Preparations from a security standpoint have been underway for months. Federal law enforcement working with private companies like Security Resources Unlimited of Waukesha, Wisconsin. The watchword is flexibility. You always have to pivot. Brian Dorough heads that company. There may be intel that comes forward where now you're like, okay, maybe you look at other parts of the community. Factoring in major incidents like the assassination attempt in Pennsylvania. Jim Ryan, ABC News, Milwaukee.