Letters to Congress on Extension of New START Treaty and Act to Maintain Limits on Russian Nuclear Forces, November 27, 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
Letter to Under Secretary Gottemoeller Regarding President's Visit to Hiroshima, May 6, 2016
Letter to Under Secretary of Stater Gottemoeller Regarding President's Visit to Hiroshima, May 26, 2016
Letter to Bishop Nagoya on the 60th Anniversary of the Bombings of Hiroshima and Nagasaki, August 2, 2005