Republican presidential nominee Donald Trump gestures as he speaks to the Economic Club of New York luncheon in Manhattan, New York, U.S., September 15, 2016. REUTERS/Mike Segar

The logo of Exxon Mobil Corporation is shown on a monitor above the floor of the New York Stock Exchange in New York, New York, U.S. December 30, 2015. REUTERS/Lucas Jackson/File Photo

People holding mobile phones are silhouetted against a backdrop projected with the Twitter logo in this illustration picture taken in Warsaw September 27, 2013. REUTERS/Kacper Pempel/Illustration/File Photo

A Wells Fargo branch is seen in the Chicago suburb of Evanston, Illinois, U.S. on February 10, 2015. REUTERS/Jim Young/File Photo

A European Union flag is waved over a statue of former Prime Minister Winston Churchill as demonstrators protest during a "March for Europe" against the Brexit vote result earlier in the year, in London, Britain, September 3, 2016. REUTERS/Luke MacGregor

U.S. first lady Michelle Obama waves as she appears onstage during the first session at the Democratic National Convention in Philadelphia, Pennsylvania, U.S., July 25, 2016. REUTERS/Jim Young/File Photo

U.S. First lady Michelle Obama addresses the Democratic National Convention in Philadelphia, Pennsylvania, U.S. July 25, 2016. REUTERS/Gary Cameron

New autopilot features are demonstrated in a Tesla Model S during a Tesla event in Palo Alto, California. REUTERS/Beck Diefenbach