Donald Trump Gets More Specific About Policies

After giving kids free helicopter rides at the Iowa State Fair, Trump unveils his immigration plan.
1:40 | 08/17/15

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Transcript for Donald Trump Gets More Specific About Policies
The heat being heat up in the 2016 presidential race. At the head of the pack is Donald Trump. Hovering over the competition in more ways than one. ABC's Devin Dwyer has the story. Reporter: Tonight a so-called trump tsunami still sweeping Iowa. I'm not supporting. I'm talking about him. Reporter: The gop's front-runner's private helicopter spotted above the fair for a second day after that dramatic arrival Saturday. And free rides for kids. Our Martha Raddatz exclusively tagging along. You know where we were four years ago, the people at the bottom of the polls didn't do so well. Who was here? Michele Bachmann and Rick santorum. But they're not me. They're not me. Reporter: Tonight, trump getting more serious and specific about his policies. We're building a wall it's going to be strong. Reporter: Trump says he would force Mexico to foot the bill for his border wall. By hiking fees on Visas. He tripled the number of immigration officers and end birthright citizenship which he calls the biggest magnet for illegal immigration. It's full steam ahead for trump who's willing to spend more of his own money on campaign than his rivals have raised combined. I would do that if I had to. Reporter: Trump still way ahead since that first debate, while Jeb bush has taken a hit, down to fourth place. Ben Carson surging to number two, arrived today at the fair. Can you catch trump in Iowa? It's a marathon not a sprint. Reporter: Iowans have been casting their kernels all day here at the fair. No surprise, Donald Trump, Hillary Clinton right out front.

This transcript has been automatically generated and may not be 100% accurate.

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