Key defendant, former vice president at Airbus parent company EADS, Jean-Louis Gergorin, right, and his lawyer Thierry Dalmasso arrive at the Paris court for the trial in the saga known as the Clearstream affair, Monday Sept. 21, 2009. France's former prime minister, Dominique de Villepin, goes on trial Monday on charges he helped perpetuate a smear campaign targeting his longtime rival, President Nicolas Sarkozy.