 Complete the following phrase:  When Guillermo Endara won the Presidential elections held in May 1989, the Noriega regime annulled the election, citing massive US interference. Foreign election observers, including the Catholic Church and Jimmy Carter certified the electoral victory of Endara despite widespread attempts at fraud by the regime. At the behest of the United States, the Organization of American States convened a meeting of foreign ministers but was unable to obtain Noriegas departure. The U.S. began sending thousands of troops to bases in the canal zone. Panamanian authorities alleged that U.S. troops left their bases and illegally stopped and searched vehicles in Panama. During this time, an American Marine got lost in the former French quarter of Panama City, ran a roadblock, and was killed by Panamanian Police who were then a part of the Panamanian Military. On December 20, 1989 the United States troops commenced an 