Exclusive: How Lebanon's Hariri defied Hezbollah

After hitting a dead end in efforts to defuse the crisis sweeping Lebanon, Saad al-Hariri informed a top Hezbollah official on Monday he had no choice but to quit as prime minister in defiance of the powerful Shi'ite group.The decision by the Sunni leader shocked Hussein al-Khalil, political advisor to Hezbollah leader Sayyed Hassan Nasrallah, who advised him against giving in to protesters who wanted to see his coalition government toppled.The meeting described to Reuters by four senior sources