 what we're calling an assassination attempt against our former president, Donald Trump. It's still an active crime scene. As I mentioned, we have a number of agents on scene. The FBI says Secret Service returned fire within seconds of Crooks opening fire, killing Crooks. The FBI has not yet supplied a motive for the shooting. Reaction coming in, Republicans in Congress calling on the Department of Homeland Security and the Secret Service to take part in hearings. This is ABC News. Ariel Reshef.