"A former government official familiar with the plan said that training would be done in small tranches and that U.S. allies, including Saudi Arabia, Jordan, the United Arab Emirates and France, are likely to participate." "U.S. and European officials say the most powerful anti-Assad factions are militant groups such as the Al-Nusrah and the Islamic State of Iraq and the Levant, some of which either have links to Al Qaeda or are so extreme that even Al Qaeda has denounced them."