The Exchange sits down with U.S. Sen. Cory Booker before a live audience at NHPR's Concord studio. The Democratic presidential candidate and former mayor of Newark, New Jersey, has been calling for national unity, criminal justice reform, and closing the racial wealth gap. We'll talk with the senator about these issues and more, including foreign policy. Watch a video of the forum: Listen to the forum: [ Sign up for Primarily Politics , NHPR's weekly newsletter on the New Hampshire primary ]