and , both experts in the at Brookings, discuss their new paper, “.” Their research focuses largely on how both Saudi Arabia and Iran employ Islam as a soft power tool in the conduct of their foreign policy, and also touches on case studies including Morocco, Jordan, Turkey, and Indonesia. Also in this episode, demographer , a Metropolitan Policy Program senior fellow, discusses new U.S. Census Bureau data on the declining U.S. population growth rate. Subscribe to Brookings podcasts  or on , send feedback email to , and follow us and tweet us at  on Twitter. The Brookings Cafeteria is part of the .