19 U.S.C. § 3201Section
§ 3201. Authority to grant duty-free treatment
The President may proclaim duty-free treatment (or other preferential treatment) for all eligible articles from any beneficiary country in accordance with the provisions of this chapter.
(Pub. L. 102–182, title II, §202, Dec. 4, 1991, 105 Stat. 1236; Pub. L. 107–210, div. C, title XXXI, §3103(c)(1), Aug. 6, 2002, 116 Stat. 1033.)