In Washington, defense attorneys in the CIA leak case have announced Vice President Dick Cheney will be called to testify on behalf of his former chief of staff, Lewis “Scooter” Libby. Libby is facing charges for his role in the outing of former CIA operative Valerie Plame. Plame’s husband, Joe Wilson, was an open critic of the Bush administration’s pre-war claims on Iraq intelligence. Presidential historians say Cheney’s appearance will likely mark the first time a sitting vice president testifies in a criminal case.