Letter to U.S. Department of State Regarding North Korea, February 12, 2019
Letter to National Security Advisor McMaster on Korea, February 26, 2018
Letter to Secretary of State Tillerson on Nuclear Non-Proliferation Efforts, October 3, 2017
Letter to Secretary of State Tillerson on Korea, August 10, 2017
Korean Statements Attached to Letter to Secretary of State Tillerson, August 10, 2017
Letter to Secretary of State Tillerson on Korean Peninsula and Nuclear Weapons, August 10, 2017