U.S. note 2(t)
(t) Heading 9903.01.21 covers only products of China and Hong Kong, that are donations, by persons subject to the jurisdiction of the United States, of articles, such as food, clothing, and medicine, intended to be used to relieve human suffering, except to the extent that the President determines that such donations (A) would seriously impair his ability to deal with any national emergency declared under section 1701 of title 19 of the U.S. Code, (B) are in response to coercion against the proposed recipient or donor, or (C) would endanger Armed Forces of the United States which are engaged in hostilities or are in a situation where imminent involvement in hostilities is clearly indicated by the circumstances.