Trump Plan to Deport 11 Million Immigrants Sells in Iowa

But 45 percent of Republicans who back other candidates say it's a bad idea.

Inside the Poll Numbers: Iowa’s Hidden Winners and Losers

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Nearly half of Iowans likely to attend the state's Republican presidential caucuses agree with Donald Trump's call to deport 11 million undocumented immigrants, the latest Bloomberg Politics/Des Moines Register Iowa Poll shows. Among those backing the billionaire in the state hosting the nation's first nomination balloting on Feb. 1, it's even higher, 73 percent.

The numbers offer yet another explanation for why Trump has surged ahead in Iowa and nationally, even if he has yet to provide many details on how his proposed mass deportation would work. It would cost between $400 billion to $600 billion and it would take 20 years to remove those immigrants living in the country illegally, according to the conservative-leaning American Action Forum.