22 U.S.C. § 2660

The Secretary of State shall furnish to the Director of the Government Publishing Office a correct copy of every treaty between the United States and any foreign government as soon as possible after it has been duly ratified and has been proclaimed by the President; and also of every postal convention made between the United States Postal Service, by and with the advice and consent of the President, on the part of the United States and foreign countries, as soon as possible after copies of such conventions have been transmitted to him by the United States Postal Service.