 Later in the programme, we'll hear from one photographer who captured the moment. You can actually see the bullet in one image on its trajectory towards Mr Trump's head. We'll also be asking, what did go wrong with security? How was a gunman able to get so close? And what do we know about the would-be assassin? Thomas Matthew Crooks was just 20 years old. What could have been his motive? And, of course, we'll ask what all this does for the race for the White House.