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Former Secret Service agents tell us that protecting the president starts with multiple layers of security already built in here at the White House complex. The Secret Service has *** layered security model that they use and have always used sort of this inner, outer, and middle perimeters. Those layers include visible security measures like fences, checkpoints, and restricted access points. But former Secret Service agent Bill Gauge says some of the Most important security measures are the ones the public never sees. There’s *** lot of very covert, I don’t want to call it undercover, but sort of plain clothes agents and officers that just sort of roam the area looking for any suspicious people, suspicious packages, suspicious vehicles. So it’s *** very robust security perimeter. *** series of recent security incidents have exposed the challenges of protecting President Trump outside of the White House. From *** shooting at the White House Correspondents’ Dinner in April to the pre-presidential assassination attempts at Trump’s Florida golf course and on the campaign trail in Butler, Pennsylvania, the element of protection that is at the White House needs to be brought to wherever the president is, and that’s where the problems arise because you don’t have the infrastructure, the fences, the alarms, while the White House provides. Agents with unique security advantages, new threats continue to emerge. One of the biggest challenges in recent years drones. The technology for drones. By the time, you know, the military or private industry comes up with *** countermeasure, there’s already *** counter to that countermeasure. Former agents say that’s why the Secret Service is constantly adapting to an ever changing threat environment. The Secret Service has to be nimble and change on *** dime. Something may happen today that they may have to. Totally implement *** new practice or procedure tomorrow, so they’ve got to be creative. The White House officials tell us planning for the big event actually started last fall with multiple federal agencies working together to keep people safe. Reporting in Washington, I’m national investigative correspondent John Cardinelli.