The lawyer for US vice-president Dick Cheney claimed today that the Congress lacks any authority to examine his behaviour on the job. The exception claimed by Cheney's counsel came in response to requests from congressional Democrats that David Addington, the vice-president's chief of staff, testify about his involvement in the approval of interrogation tactics used at Guantanamo Bay. Ruling out voluntary cooperation by Addington, Cheney lawyer Kathryn Wheelbarger said Cheney's conduct is not within the [congressional] committee's power of inquiry". "Congress lacks the constitutional power to regulate by law what a vice-president communicates in the performance of the vice president's official duties, or what a vice president recommends that a president communicate," Wheelbarger wrote to senior aides on Capitol Hill. The exception claimed by Cheney's office recalls his attempt last year to evade rules for classified documents by deeming the vice-president's office a hybrid branch of government - both executive and legislative. Philippe Sands QC, law professor at University College, London, has agreed to appear in Washington and discuss the revelations in Torture Team, his new book on the consequences of the brutal tactics used at Guantanamo. Two [other] witnesses sought by [Congress], former US attorney general John Ashcroft and former US justice department lawyer John Yoo, claimed that their involvement in civil lawsuits related to harsh interrogations allows them to avoid appearing before Congress. In letters to attorneys representing Ashcroft and Yoo, [Rep. John] Conyers [wrote that] "I am aware of no basis for the remarkable claim that pending civil litigation somehow immunises an individual from testifying before Congress."

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