 We've seen it every day on our walk to the convention center. Matt Gutman tonight. Matt, thank you. We turn now to that new turn this evening involving security surrounding Donald Trump. ABC News has learned that the Secret Service had already increased protection for Trump before that Pennsylvania rally because of intelligence that Iran wants to assassinate Trump. So, of course, the question now, how was that young gunman able to get on that roof, even with increased security amid concerns over Iran? Here's Pierre Thomas tonight.