The struggle to succeed Iranian Supreme Leader Ali Khamenei is growing intense. Its outcome will have significant consequences for Iran, the Middle East, and the US. Khamenei's health has been failing for years, and his retirement or passing seems increasingly imminent. Current indicators suggest that his successor will be more hardline and less willing or able to rein in the aggressive instincts of Iran's Islamic Revolutionary Guards Corps. In this episode of Overwatch, Nicholas Heras, Director of Government Relations at ISW, and Nicholas Carl, the Iran Team Lead at the Critical Threats Project at the American Enterprise Institute, discuss the leading candidates to succeed Khamenei, their policy views on engaging with the United States and the West, and how the process of picking the next Supreme Leader could affect US policy on Iran.