 Assassins all have predictable behaviors. Assassins all typically may tell somebody or somehow indicate that they're going to conduct this kind of attack. Donald Trump today called for unity and resilience. President Biden speaks to the nation tonight in a couple of hours. Flags in Pennsylvania are at half staff in honor of the man killed in the shooting, Corey Comportor. Governor Josh Shapiro says that he died a hero while protecting his family. You're listening to ABC News.