What are the consequences of retrenchment in foreign policy? Professor Robert Lieber argues that the consequences of foreign policy retrenchment  in recent years have been costly, and caused the US to lose credibility with friends and foes. America retains the capacity to lead, he argues, but unless it resumes a more robust role, the world is likely to become a more dangerous place, with mounting threats not only to regional stability and international order, but to the national interests of America itself.

Below, listen as author Robert J. Lieber presents his new book, Retreat and its Consequences: American Foreign Policy and the Problem of World Order.