Rep. Ro Khanna joins Jonathan to talk about Iran, the Sanders campaign and why the Democratic field has become so white.

Rep. Swalwell on impeachment: ‘America won’t get a fair trial if witnesses don’t testify’

Opinion writer Jonathan Capehart talks with newsmakers who challenge your ideas on politics, and explore how race, religion, age, gender and cultural identity are redrawing the lines that both divide and unite America. "Capehart" is a podcast from Washington Post Opinions, with conversations adapted from Washington Post Live events.