; and (iii) working with distributors of medical supplies to manage the domestic reserves established under this subparagraph by refreshing and replenishing stock of critical medical supplies. . (b) Reporting; sunset Section 319F–2(a) of the Public Health Service Act (42 U.S.C. 247d–6b(f)) is amended by adding at the end the following: (6) Reporting Not later than September 30, 2022, the Secretary shall submit to the Committee on Energy and Commerce of the House of Representatives and the Committee on Health, Education, Labor, and Pensions of the Senate a report on the details of each purchase, lease, or joint venture entered into under paragraph (3)(K), including the amount expended by the Secretary on each such purchase, lease, or joint venture. (7) Sunset The authority to make purchases, leases, or joint ventures pursuant to paragraph (3)(K) shall cease to be effective on September 30, 2023. . (c) Funding Section 319F–2(f) of the Public Health Service Act (42 U.S.C. 247d–6b(f)) is amended by adding at the end the following: (3) Supply chain elasticity (A) In general For the purpose of carrying out subsection (a)(3)(K), there is authorized to be appropriated $500,000,000 for each of fiscal years 2020 through 2023, to remain available until expended. (B) Relation to other amounts The amount authorized to be appropriated by subparagraph (A) for the purpose of carrying out subsection (a)(3)(K) is in addition to any other amounts available for such purpose. .