Republican 2016 presidential candidates pose at the start of the first official Republican presidential candidates debate of the 2016 U.S. presidential campaign in Cleveland

Republican 2016 presidential candidates (L-R), U.S. Senator Marco Rubio, Dr. Ben Carson, Wisconsin Governor Scott Walker, businessman Donald Trump, former Florida Governor Jeb Bush and former Arkansas Governor Mike Huckabee, pose together at the start of the first official Republican presidential candidates debate of the 2016 U.S. presidential campaign in Cleveland, Ohio, August 6, 2015. REUTERS/Brian Snyder – RTX1NE3Y