On GPS, the most divisive issue in America? Immigration. It brought the U.S. government to its knees. What's behind the passion on both sides? Is there a compromise? Also, in the wake of the false alert in Hawaii, what you need to know about North Korea's nuclear capabilities...and America's ability to defend against a nuclear attack. GUESTS: Margaret Hoover, David Frum, Niall Ferguson, Nate Cohn, Harry Enten, Alex Wellerstein

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