Potential witnesses in the upcoming criminal trial of I. Lewis "Scooter" Libby, as referenced in court papers by Libby's lawyers. The trial is scheduled for January: _Richard Armitage, former deputy secretary of state. _Ari Fleischer, former White House press secretary. _Marc Grossman, former undersecretary of state for political affairs. _Colin Powell, the former secretary of state. _Karl Rove, the deputy White House chief of staff. _George Tenet, the former CIA director. _Joseph Wilson, a former U.S. ambassador. _Valerie Plame Wilson. _Stephen Hadley, the president's national security adviser. Libby's lawyers said Hadley may offer important testimony about discussions within the administration...