 stage at an indoor rally. It's his first since last week's assassination attempt at a rally in Pennsylvania. His running mate, Senator J.D. Vance, also with him, earlier introducing himself to the crowd. Some of you may not know me, and so I just thought I'd introduce myself a little bit to those who have it. I am just blessed and so grateful to be up here. ABC's Phil Lipov has more on the investigation into security at the rally in Pennsylvania and the shooter who was flagged as suspicious ahead of that rally.