Northern Ireland's border with the Republic of Ireland is a major issue as Brexit negotiations continue. The customs union has become a important aspect to Prime Minister Theresa May's dealings with the House of Lords and with the European Union. Host Dan Loney talks with Brendan O'Leary, Lauder Professor of Political Science at the University of Pennsylvania, and Michelle Egan, Professor in the School of International Service at American University and Global Fellow at the Wilson Center, to discuss the latest in the impending Brexit on Knowledge@Wharton. See acast.com/privacy for privacy and opt-out information.