On December 13, 2016, the Office of the United States Trade Representative (USTR) published in the Federal Register a final rule [Docket Number USTR-2016-0016] that adds subparts A and D to part 2004 of the USTR regulations. Subpart A contains definitions used throughout part 2004. Subpart D governs how USTR responds to official demands and informal requests for records, information or employee testimony in connection with legal proceedings in which neither the United States nor USTR is a party. It includes the requirements and procedures for demanding or requesting parties to submit demands or requests, and factors for USTR to consider in determining whether USTR employees will provide records, information or testimony relating to their official duties. The final rule was effective on publication.