Airs Sunday, January 13, 2019, at 6 p.m. For the United States, tensions are rising with both allies and adversaries. What does this 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 NATO no longer fit for purpose? Is the Russia threat overblown? And is it time to take a hard line on Iran? The debaters are Derek Chollet, John J. Mearsheimer, Stephen F.