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3 big immigration questions the GOP 2016 field must answer

Republican candidates are trying to leave their plans on immigration to voters' imaginations. Here's how to pin them down.

Law enforcement agents watch for immigrants crossing the Rio Grande illegally into the United States on July 24, 2014 in Mission, Texas. (Photo by John Moore/Getty)
Law enforcement agents watch for immigrants crossing the Rio Grande illegally into the United States on July 24, 2014 in Mission, Texas.Getty Images

Benjy Sarlin