Democratic presidential candidate Hillary Clinton gives a thumbs up as she boards her campaign plane in White Plains, New York, United States September 15, 2016, to resume her campaign schedule following a bout with pneumonia. REUTERS/Brian Snyder

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

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

A woman pumps gas at a station in Falls Church, Virginia December 16, 2014. REUTERS/Kevin Lamarque

Republican presidential nominee Donald Trump is interviewed by investor John Paulson at the Economic Club of New York luncheon in Manhattan, New York, U.S., September 15, 2016. REUTERS/Mike Segar

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

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

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