 You know, I spent some time in the Marine Corps, so I recognized gunfire. But I thought surely it might have been a firecracker or something. I heard the first one. I heard the second. And then I realized what it was that was happening. CBS's Robert Costa says there was clearly a breakdown in security. This was a catastrophic security failure in the eyes of many of my sources already. Trump is someone who has rallies almost every week, sometimes multiple times a week.