 I'm Matt Piper in Milwaukee. The U.S. Secret Service is the leading coordinating agency for this week's events. Agent Audrey Gibson-Caccino says nothing changed after what happened in Pennsylvania. We are confident in the security plans that are in place for this event, and we're ready to go. It's been an 18-month process. Michael Hensel is with the FBI. Currently, there are no known articulated threats against the RNC or anyone visiting the RNC. For Donald Trump, it also means a shifting of focus. He says he's torn up his original speech and will call for unity. Correspondent Bob Costa has more.