In February 2018, the Trump administration released the Nuclear Posture Review (NPR), which seeks to ensure that the United States will continue to maintain a safe, secure, and effective deterrent that protects the U.S. homeland, assures allies, and above all, deters adversaries. The NPR devotes significant attention to extended deterrence and recommends several specific actions to enhance U.S. and allied capabilities. However, in the current security environment, serious questions have emerged about the continued credibility of the U.S. extended deterrent. On April 24, the Foreign Policy program at Brookings will host an event featuring a keynote address by Deputy Undersecretary of Defense Dave Trachtenberg, followed by a panel discussion involving experts and former government officials, to explore the issue in greater detail. Keynote speaker David J. Trachtenberg, Deputy Undersecretary for Policy, U.S. Department of Defense Panelists Elaine Bunn, Former Deputy Assistant Secretary for Nuclear and Missile Defense Policy, U.S. Department of Defense Kathleen Hicks, Senior Vice President, Henry A. Kissinger Chair, and Director, International Security Program, CSIS Jon Wolfsthal, Director, Nuclear Crisis Group; Senior Advisor, Global Zero Moderator: Frank A. Rose, Senior Fellow, Foreign Policy, The Brookings Institution