War powers in the 21st century: hearing before the Committee on Foreign Relations, United States Senate, One Hundred Eleventh Congress, first session, April 28, 2009.

War powers in the 21st century: hearing before the Committee on Foreign Relations, United States Senate, One Hundred Eleventh Congress, first session, April 28, 2009.

War powers for the 21st century : the Congressional perspective : hearing before the Subcommittee on International Organizations, Human Rights, and Oversight of the Committee on Foreign Affairs, House of Representatives, One Hundred Tenth Congress, second session, March 13, 2008.

War powers for the 21st century : the Constitutional perspective : hearing before the Subcommittee on International Organizations, Human Rights, and Oversight of the Committee on Foreign Affairs, House of Representatives, One Hundred Tenth Congress, second session, April 10, 2008.

War powers for the 21st century: the executive branch perspective: hearing before the Subcommittee on International Organizations, Human Rights, and Oversight of the Committee on Foreign Affairs, House of Representatives, One Hundred Tenth Congress, second session, April 24, 2008.