Dan Chiasson, Wellesley College English professor and author, discusses Bernie Sanders' early political life in Burlington. Nina Olson, former National Taxpayer Advocate, breaks down this tax-filing season and recent law changes. Danielle Pletka, AEI foreign policy expert, and Rose Kalanick, Defense Priorities analyst, debate U.S. goals, risks, and verification challenges in U.S.-Iran nuclear talks and regional security.