 It's 644. Good morning. I'm John Doman. And I'm John Aaron. The search for answers continues after the attempted assassination of former President Trump. Many questions remain unanswered about how the 20-year-old gunman managed to get access to a nearby roof where he opened fire. And joining us live on Skype is WTOP National Security Correspondent J.J. Green. All right, J.J., good morning. I mean, this is going to be a long question, or a long answer, I should say. Can you tell us more on the security failures up there in Pennsylvania?