On this week's Beg to Differ Podcast with host Mona Charen, regular panelists Damon Linker, Bill Galston, and Linda Chavez are joined by special guest David Frum to discuss Iran and President Trump's "maximum pressure" foreign policy, the role of oil in the Middle East, the trade war with China, global warming, and what to do to combat anti-Semitism. Special Guests: Bill Galston, Damon Linker, David Frum, and Linda Chavez.