 To have him here and to have the nomination, Senator Vance, I mean, it's unbelievable. Today's keynote message is Make America Safe Again, emphasizing Trump's support for law enforcement. The theme was chosen before Saturday's attempt on the former president's life. Jim Ryan, ABC News, Milwaukee. We are learning more about the attempted assassination. ABC senior investigative correspondent Aaron Katursky is in shooter Thomas Crook's hometown of Bethel Park, Pennsylvania.