Des Moines, UNITED STATES
Republican presidential candidate and U.S. Senator of Florida Marco Rubio speaks to reporters as his...
Republican presidential candidate and U.S. Senator of Florida Marco Rubio (C) speaks to reporters as his son looks on and Senator Chuck Grassley (R-IA) (L) listens at the Iowa State Fair in Des Moines, Iowa August 18, 2015. REUTERS/Joshua Lott