Thomas Crooks pictured almost an hour before he shot Trump: Sniper identified gunman acting suspiciously checking his cell phone and a rangefinder at rally when they took photo

Security service officials had would-be assassin Thomas Matthew Crooks on their radar for more than 40 minutes before he shot Donald Trump, a new image reveals. 

A photograph showing the 20-year-old gunman appearing to crawl on the ground while scouring the area was circulated to law enforcement as a suspicious sighting at 5:30pm during the Butler, Pennsylvania rally on July 14, according to

Around 6.11pm, Crooks took up a position on a slanted warehouse roof and shot at Trump from a…