** FILE ** Undersecretary of State Marc Grossman speaks to reporters at a news conference in Bogota, Colombia in this Feb. 5, 2002, file photo. Four years after President Bush's State of the Union speech touched off a stormy debate over the threat posed by Iraq, former White House aide "Scooter" Libby goes on trial Tuesday, Jan. 16, 2007, in the CIA leak investigation, and defense attorneys for Libby have called the former undersecretary "a critical witness for the government." (AP Photo/Ariana Cubillos, File()