After former Pres. Donald Trump agreed to debate Vice Pres. Kamala Harris on ABC Sept. 10, Selina Wang reports on Trump's Mar-a-Lago news conference, which marked his first public appearance since the debut of the new Democratic ticket; Aaron Katersky has details on the newly-released body camera video capturing the moment local police confronted the gunman who opened fire on former Pres. Trump during his July rally in Butler, Pennsylvania; Mireya Villarreal reports on the tragic death of CrossFit athlete Lazar Dukic, who appeared to drown during the first day of CrossFit Games in Fort Worth, Texas; and more on tonight's broadcast.