Witnesses testified about the role of administration lawyers in the formulation of detainee interrogation policy at Guantanamo Bay. Questions focused on the witnesses' participation in the drafting of legal memos relating to the president's constitutional authority to authorize the interrogation techniques used at Guantanamo Bay and the legality of those techniques. Witnesses were also questioned about how they reached those conclusions. Exchanges were often heated between Democratic members and Mr. Addington, who was subpoenaed to appear. Mr. Yoo cited instructions from the Justice Department when refusing to answer several questions about meetings. The hearing was titled "From the Department of Justice to Guantanamo Bay: Administration Lawyers and Administration Interrogation Rules, Part III."