Donald Trump’s tough talk on illegal immigration was a big part of the reason Dave Hagstrom and many others in this booming Phoenix suburb supported him for president. “Walls make good neighbors,” Hagstrom said. So when the president moved this week to cut a deal — with Democrats no less — to block the expulsion of 800,000 immigrants brought to the U.S. illegally as children, was Hagstrom disappointed? Not at all. “If you were to deport them, where would they go?” Hagstrom, 60, a car-warranty manager, asked on his way to a Bible-study dinner at an upscale shopping mall. “To...