Last year, two men showed up in Benson, Ariz., a small desert town 60 miles from the Mexico border, offering a deal.

Glenn Nichols, the Benson city manager, remembers the pitch.

"The gentleman that's the main thrust of this thing has a huge turquoise ring on his finger," Nichols said. "He's a great big huge guy and I equated him to a car salesman."

What he was selling was a prison for women and children who were illegal immigrants.

"They talk [about] how positive this was going to be for the community," Nichols said, "the amount of money that we would realize from each prisoner on a daily rate."

But Nichols wasn't buying. He asked them how would they possibly keep a prison full for years — decades even — with illegal immigrants?

Laura Sullivan/NPR

Glenn Nichols, city manager of Benson, Ariz., says two men came to the city last year "talking about building a facility to hold women and children that were illegals."

"They talked like they didn't have any doubt they could fill it," Nichols said.