New Jersey Governor Chris Christie speaks to the American Chamber of Commerce of Mexico, at a hotel in Mexico City September 3, 2014. The U.S. should scrap its long-standing restrictions on crude oil exports, Christie, one of the top Republican prospects for the 2016 presidential race said on Wednesday. Christie is on a three-day trade mission in Mexico. REUTERS/Henry Romero (MEXICO - Tags: POLITICS BUSINESS ENERGY)