; (C) the number of United States citizens who the Government of China has prohibited from leaving China for any of the reasons described in subsection (a); and (D) for each of the United States citizens referred to in subparagraph (C), the period during which they have been forced to remain in China. (2) Form The report required under paragraph (1) shall be submitted in unclassified form, but may include a classified annex. (3) Exclusion of personally identifiable information The Secretary of State may not include any personally identifying information of any United States citizen in any of the reports submitted to Congress under paragraph (1). (4) Privacy act Any information obtained by the Secretary of State to complete the report under this subsection shall be subject to section 552a of title 5, United States Code (commonly known as the Privacy Act ). (d) Waiver for national interest (1) In general The Secretary of State may waive the application of subsection (a) in the case of an alien if the Secretary determines that such waiver— (A) is necessary to permit the United States to comply with the Agreement Regarding the Headquarters of the United Nations, signed at Lake Success June 26, 1947, and entered into force November 21, 1947 (TIAS 1676), or any other applicable international obligation of the United States; or (B) is in the national interest of the United States. (2) Notification Upon granting a waiver under paragraph (1), the Secretary of State shall submit a report to the congressional committees listed in subsection (b)(2) that— (A) details the evidence and justification for the necessity of such waiver; and (B) if such waiver is granted pursuant to paragraph (1)(B), explains how such waiver relates to the national interest of the United States.