A former U.S. official said the Bush administration relied on a theory of national self-defense to kill Mughniyah, claiming he was a lawful target because he was actively plotting against the United States or its forces in Iraq, making him a continued and imminent threat who could not be captured. Such a legal rationale would have allowed the CIA to avoid violating the 1981 blanket ban on assassinations in Executive Order 12333. The order does not define assassination.