 CBS News Special Report. I'm Monica Ricks. It is 4.33. Now turning our attention to the attempted assassination of former President Donald Trump at a rally, campaign rally, last Saturday in Bethel, Pennsylvania. Investigators are digging into the background of the man who shot Trump and two other spectators and killed a former firefighter who was in the crowd. WTOP National Security Correspondent J.J. Green joins us live with the details. J.J.?