U.S. Secret Service

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Pasadena Police Chief Phillip Sanchez, center, speaks about safety issues ahead of next week's 128th Rose Parade as he is joined by Pasadena Fire Chief Bertral Washington, background right, and Rob Savage, special agent in charge of the U.S. Secret Service Wednesday, Dec. 28, 2016, in Pasadena, Calif. (AP Photo/Jae C. Hong)

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Pasadena Police Chief Phillip Sanchez, right, speaks about safety issues ahead of next week's 128th Rose Parade as he is joined by Pasadena Fire Chief Bertral Washington, left, and Rob Savage, special agent in charge of the U.S. Secret Service Wednesday, Dec. 28, 2016, in Pasadena, Calif. (AP Photo/Jae C. Hong)

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Former President Bill Clinton stands in the Field of Empty Chairs at the chair of Oklahoma City bombing victim Alan G. Whicher,of the U.S. Secret Service, after lying a bouquet of flowers on the chair during a visit to the Oklahoma City National Memorial in Oklahoma City. (AP Photo/Bryan Terry, Pool)

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This handout photo provided by the US Secret Service shows the drone that crashed onto the White House grounds in Washington, Monday, Jan. 26, 2015. An intelligence agency employee whose drone crashed on the White House lawn earlier this year won't face criminal charges, the U.S. Attorney’s Office in Washington announced Wednesday. Shawn Usman, who works for the National Geospatial-Intelligence Agency, was piloting the borrowed drone in downtown Washington early on Jan. 26 when he lost control of it. Prosecutors said Usman, who had borrowed the drone from a friend, tried to regain control of the aircraft while it was flying westward and climbed to about 100 feet at about 3 a.m. (AP Photo/US Secret Service)

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A U.S. Secret Service agent waits by the spare limousine before President Barack Obama's motorcade departs for a tour of the Forbidden City in Beijing, China, Nov. 17, 2009. (Official White House Photo by Pete Souza)

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A U.S. Secret Service agent waits by the spare limousine before President Barack Obama's motorcade departs for a tour of the Forbidden City in Beijing, China, Nov. 17, 2009. (Official White House Photo by Pete Souza)

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U.S. Secret Service agents hold open the door as President Obama steps out of his vehicle to board Air Force One at Andrews Air Force Base in suburban Washington on Monday, Dec. 10, 2012, as he traveled to Michigan to visit the Daimler Detroit Diesel plant in Redford. (AP Photo/Charles Dharapak)

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U.S. Secret Service agents stands watch as Republican presidential candidate Mitt Romney addresses the U.S. Hispanic Chamber of Commerce in Los Angeles on Monday, Sept. 17, 2012. (AP Photo/Charles Dharapak)