https://www.thedailybeast.com/how-the-secret-service-foiled-an-assassination-attempt-against-trump-by-isis

Twenty-one years later, there was a plot against President Trump’s life in Manila—a shocking fact revealed in United States Secret Service: On the Front Line, a two-hour special airing on the National Geographic Channel Sunday night that—for the first time—provides viewers with a behind-the-scenes glimpse of the workings of the Secret Service, and the complex measures they take to protect the president of the United States.

President Trump (codename: “Mogul”) was due to arrive in the bustling city to meet with Philippine President Rodrigo Duterte and other South Asian leaders at the ASEAN 50 summit in November 2017. Chad Ragan, a special agent in the Presidential Protective Division, was the Secret Service agent in charge for the trip; Audrey Gibson, a special agent in the Protective Intelligence & Assessment Division (aka “The Bubble”), served as his eyes and ears.

The Secret Service comprises four main teams: Protective Intelligence; Uniformed Division; Protective Operations; and Investigations. The Protective Operations team includes those in the “inner circle,” standing steps from POTUS, and special ops, such as countersnipers and the K-9 explosive detection unit. Protective Intelligence analyzes threats against the president, both on and offline. The Uniformed Division guards the White House or anywhere POTUS goes. And Investigations monitors the motives of people who make threats against the president.