With unprecedented access, National Geographic cameras go behind-the-scenes with the US Secret Service. Shift agents, intelligence agents, counter-snipers, and canine explosive ordinance units create a 360-degree shield that covers President Trump wherever he goes. We'll also bring to light stories never-before told by the Secret Service, like the time President Clinton was nearly assassinated by Osama bin Laden, and how those moments forever changed the protective strategy of the agency.