Republican presidential candidate Donald Trump speaks to potential supporters at a campaign stop at Living History Farms in Urbandale, Iowa on Friday January 15, 2016 in Urbandale, Iowa. (Photo by Steve Pope/Getty Images)
Republican presidential candidate Donald Trump speaks to potential supporters at a campaign stop at Living History Farms in Urbandale, Iowa on Friday January 15, 2016 in Urbandale, Iowa. (Photo by Steve Pope/Getty Images)
Republican presidential candidate Donald Trump speaks to potential supporters at a campaign stop at Living History Farms in Urbandale, Iowa on Friday January 15, 2016 in Urbandale, Iowa. (Photo by Steve Pope/Getty Images)
Republican presidential candidate Donald Trump speaks to potential supporters at a campaign stop at Living History Farms in Urbandale, Iowa on Friday January 15, 2016 in Urbandale, Iowa. (Photo by Steve Pope/Getty Images)
Republican presidential candidate Donald Trump speaks to potential supporters at a campaign stop at Living History Farms in Urbandale, Iowa on Friday January 15, 2016 in Urbandale, Iowa. (Photo by Steve Pope/Getty Images)
Republican presidential candidate Donald Trump speaks to potential supporters at a campaign stop at Living History Farms in Urbandale, Iowa on Friday January 15, 2016 in Urbandale, Iowa. (Photo by Steve Pope/Getty Images)
Republican presidential candidate Donald Trump speaks to potential supporters at a campaign stop at Living History Farms in Urbandale, Iowa on Friday January 15, 2016 in Urbandale, Iowa. (Photo by Steve Pope/Getty Images)