Modifications proclaimed by the President under subsection (a) may not take effect before the 30th day after the date on which the text of the proclamation is published in the Federal Register.
19 U.S. Code § 3006 - Presidential action on Commission recommendations
2006—Subsec. (c). Pub. L. 109–432 substituted “30th” for “15th”.
Memorandum for the United States Trade Representative
By virtue of the authority vested in me by the Constitution and laws of the United States, including section 301 of title 3 of the United States Code and the Omnibus Trade and Competitiveness Act of 1988 (Public Law 100–418) (“the Act”) [see Tables for classification], you are hereby delegated the functions vested in me by section 1206(b) of the Act (19 U.S.C. 3006(b)), to submit to the Committee on Ways and Means of the House of Representatives and the Committee on Finance of the Senate reports that set forth proposed modifications to the Harmonized Tariff Schedule [see 19 U.S.C. 1202] and the reasons therefor.
The President shall retain the authority under section 1206 of the Act to proclaim modifications to the Harmonized Tariff Schedule after the layover period specified in section 1206(b) has expired.
You are authorized and directed to publish this memorandum in the Federal Register.