For the United States, tensions are rising with both allies and adversaries. Rogue states are racing to master new technologies and create weapons of mass destruction. And faith in international institutions is seemingly deteriorating. What does this all mean for U.S. national security? Staged in our "unresolved" format, five esteemed foreign policy thought leaders will argue for or against a number of motions revolving around some of America’s most pressing national security issues, including: Is it time to take a hard line on Iran? Is NATO no longer fit for purpose? And, is the Russia threat overblown?