John Yoo quoted by US News & World Report, Jan. 31, 2017
“This is a big mistake,” Yoo says. “Such a policy would prevent the U.S. from targeting Anwar al-Awlaki, for example. It would create a force field around any U.S. citizen who joins al-Qaida or ISIS. Al-Qaida and ISIS leaders would immediately start recruiting Americans, even more heavily than now, and placing them in leadership positions.”