Although the ban on assassination contained in Executive Order 12,333 has the force and effect of a congressional statute,12 the President can evade the order's mandate and legally carry out the assassination
of a foreign leader in four ways. He [sic] could:
(1) Ask Congress to declare war, in which case a foreign leader exercising command responsibility would become a legitimate target;
(2) Construe Article 51 of the United Nations Charter to permit the
assassination of a foreign leader based on either a right to self-defense or a right to respond to criminal activities;
(3) Narrowly interpret the order as not restricting the President as long as he does not approve specific plans for the killing of individuals;
or
(4) Overrule the order, create an exception to it, or permit the Congress to do the same.
By using any of these methods, a president could theoretically order the assassination of a foreign leader without violating Executive Order 12,333.