Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, rides a golf cart at the Iowa State Fair in Des Moines, Iowa, U.S., on Saturday, Aug. 15, 2015. Billionaire Republican 2016 contender Donald Trump said this week unlike rivals such as Jeb Bush, he wouldn't be beholden to big-money campaign donors if elected president. Photographer: Andrew Harrer/Bloomberg via Getty Images