Letter to U.S. Senate Urging Ratification of New START Treaty, April 15, 2010
Letter to U.S. Senate on U.S. Nuclear Policy, September 28, 2009
Letter to U.S. Senate Urging Ratification of New START Treaty, November 29, 2010
Letter to U.S. Senate on Funding for Reliable Replacement Warhead Program, December 5, 2005
Letter to Secretary of State Clinton on U.S. Policy Towards Nuclear Nonproliferation , April 8, 2009
Letter to U.S. House of Representatives in Support of Global Security Priorities Act and Nuclear Nonproliferation Efforts, February 5, 2008
Letter to President Obama in Support of the New START Treaty, in Spanish, April 8, 2010
Letter to President Obama in Support of New START Treaty, April 8, 2010
Letter to U.S. House of Representatives on Global Security Priorities Resolution and Savings from Reducing Nuclear Arsenal, November 2, 2009
Letter to U.S. House of Representatives Regarding Global Security Priorities Act and Nuclear Nonproliferation, March 30, 2009
Letter to U.S. House of Representatives on Global Security Priorities Act and Nuclear Arms Reduction, July, 11, 2008
Letter to Congress Urging the End of Funding for Reliable Replacement Warhead Program, May 9, 2007
Letter to Congress Regarding Research on Robust Nuclear Earth Penetrator, May 10, 2005
Letter to U.S. Senate on Funding for Nuclear Weapons in the Energy and Water Appropriations Bill, September 15, 2003
Letter to U.S. Senate on Nuclear Weapons Research Funding, July 18, 2005
Letter to Congress on Negotiations with Iran Over Its Nuclear Program, January 6, 2014
Letter to Secretary of State Kerry on Interim Agreement Regarding Iran's Nuclear Program, November 27, 2013
Letter to Secretary of State Kerry on Arms Trade Treaty and Negotiations with Iran Over Its Nuclear Program, October 4, 2013
Letter to President Obama on Nuclear Disarmament and on Middle East Peace, June 25, 2013
Letter to Colleagues on the Anniversaries of the Bombing of Hiroshima and of Pacem in Terris and of The Challenge of Peace, August 6, 2003