Abdul Aziz al-Hakim, the leader of the largest and most powerful Shiite party in Iraq, is in the United States for urgent medical attention, according to U.S. officials and his organization. His party, the Islamic Supreme Council of Iraq, refused to discuss Hakim's diagnosis, but U.S. officials said the cleric, 57, has been found to have lung cancer and is in the United States for further tests and to develop a treatment plan. In a reflection of Hakim's stature, President Bush authorized immediate transportation to get Hakim from Iraq to the United States, an administration source said yesterday. Vice President...