; applicability date (a) Severability If any provision of this Act, any amendment made by this Act, or the application thereof to any person or circumstances is held invalid, the validity of the remainder of the Act, of any such amendments, and of the application of such provisions to other persons and circumstances shall not be affected thereby. (b) Applicability date Subsection (f) of section 702 of the Foreign Intelligence Surveillance Act of 1978 ( 50 U.S.C. 1881a ), as amended by this Act, shall apply with respect to certifications submitted under subsection (h) of such section to the Foreign Intelligence Surveillance Court after January 1, 2024.