On this annual edition of Encounter, Georgetown professors Anthony (Tony) Arend and Amb. Mark Lagon talk with host Carol Castiel about the most pressing national security and foreign policy challenges facing the United States in 2023. Will the new Republican-led House of Representatives hamper US President Joe Biden’s ability to mobilize robust financial support for Ukraine against Russia? In addition to the rise of China, what other long-term geostrategic priorities require US leadership?