 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. There are so many questions to be answered. Who received that information being relayed about the shooter? And did concerns of a suspicious person and a possible threat to the former president get to Secret Service commanders on site? Well, the director of the Secret Service will face those questions and more as she plans to testify about the assassination attempt Monday.