 I'm Tom Ergoni. We're learning more about the investigation into Saturday's assassination attempt against Donald Trump and actions taken by shooter Thomas Crooks beforehand. Fox's David Spunt reports. Fox News has learned before the shooting, rally goers spotted a suspicious man with what appeared to be binoculars or a range finder, a device used to measure distances. Sources also say that same person, later identified as Crooks, was pacing around magnetometers and the security barrier before the event began.