Secret Service agents use a presidential limousine for cover from spraying water as President Donald Trump lands via Marine One helicopter in New York, May 4, 2017. REUTERS/Jonathan Ernst

Secret Service agents take positions on a tarmac as President Donald Trump arrives at Morristown municipal airport, New Jersey, after attending the Celebrate Freedom Rally in Washington, July 1, 2017. REUTERS/Yuri Gripas

Secret Service agents walk into Trump Tower, the permanent home of President Donald Trump, in Manhattan, New York City, August 4, 2017. REUTERS/Mike Segar

Secret Service agents maintain a watch before President Donald Trump departs for a trip to the G20 Summit from the White House in Washington, July 5, 2017. REUTERS/Joshua Roberts

A Secret Service agent stands guard over the Presidential limo as President visits Waukesha County Technical College in Pewaukee, Wisconsin, June 13, 2017. REUTERS/Kevin Lamarque

A Secret Service counter assault team members walks before President Donald Trump's inauguration on Capitol Hill in Washington, January 20, 2017. REUTERS/Yuri Gripas

President Donald Trump and First Lady Melania Trump board Air Force One for travel to Poland and Germany from Joint Base Andrews, Maryland, July 5, 2017. REUTERS/Carlos Barria

A Secret Service counter-assault team member keeps watch from the roof of the White House during a potential security threat on the North Lawn in Washington, May 31, 2017. REUTERS/Jonathan Ernst

President Donald Trump is surrounded by Secret Service for an event with fellow G7 leaders during their summit in Taormina, Sicily, Italy, May 26, 2017. REUTERS/Jonathan Ernst

A Secret Service counter-assault team arrives just ahead of U.S. President Donald Trump's helicopter at the Wall Street landing zone in New York, May 4, 2017. REUTERS/Jonathan Ernst

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