Elaine Kamarck, a senior fellow in the Governance Studies program and director of the Center for Effective Public Management at the Brookings Institution, discusses her new report "Hitting the wall: On immigration, campaign promises clash with policy realities" and addresses the costs associated with implementing Trump's proposed policies. Also in this episode: David Wessel, director of the Hutchins Center on Fiscal & Monetary Policy, explains productivity growth in our regular "Wessel's Economic Update" segment. Subscribe to Brookings podcasts here or on Apple Podcasts, send feedback email to BCP@Brookings.edu, and follow us and tweet us at @policypodcasts on Twitter. The Brookings Cafeteria is a part of the Brookings Podcast Network.