((a)) ** National security considerations** No proclamation shall be made pursuant to the provisions of this chapter reducing or eliminating the duty or other import restriction on any article if the President determines that such reduction or elimination would threaten to impair the national security.

((b)) ** Action taken under other laws** While there is in effect with respect to any article any action taken under , or section 1862 or 1981 of this title, the President shall reserve such article from negotiations under this subchapter (and from any action under ) contemplating reduction or elimination of—

((A)) any duty on such article,

((B)) any import restriction imposed under such section, or

((C)) any other import restriction, the removal of which will be likely to undermine the effect of the import restrictions referred to in subparagraph (B).