"In the 1980s, Saudi Arabia worked with the U.S. and Pakistan to arm and train Islamic extremist groups in order to fight the Soviet Union. And today, the Saudi regime continues to support extremist groups like the al-Qaeda-affiliated al-Nusra Front in Syria, which some analysts have argued is even more dangerous than ISIS. Saudi Arabia firmly rejects that any support for the Sept. 11 attackers came from its country. But 15 of the 19 hijackers responsible for the attacks were Saudi citizens. Additionally, Zacarias Moussaoui, a convicted 9/11 plotter, confessed in sworn testimony to U.S. authorities that members of the Saudi royal family had funded al-Qaeda before the attack. Saudi Arabia strongly denies that this is true."