The trial of former Chief of Staff to Vice President Dick Cheney will feature a likely appearance from his former boss in what historians believe would be the first time a sitting vice president has testified in a criminal trial. Mr. Cheney would testify for the defense.
I. Lewis Libby Jr., the former chief of staff to Vice President Dick Cheney, will go on trial on Tuesday, nearly three years after a C.I.A. operative’s name appeared in a newspaper column, setting off a major investigation of who leaked the name and why. But neither Mr. Libby nor anyone else has been charged