and list products and processes that use a perfluoroalkyl or polyfluoroalkyl substance that have a use in a product that is required to be used under Federal law (including regulations), Federal standards, or Federal Government specifications. (B) Submission to other agencies If the Administrator receives a petition under paragraph (2) or begins to carry out the alternative designation process under paragraph (3) with respect to a use described in subparagraph (A), the Administrator shall, on receipt of the petition, share the petition with the head of the Federal agency that required the use for a review and comment period of not less than 30 days. (6) Review of previous designations The Administrator may, pursuant to a petition from a petitioner or at the discretion of the Administrator, review the designation of a use of a perfluoroalkyl or polyfluoroalkyl substance as a nonessential use or an essential use and redesignate that use as a nonessential use or an essential use in accordance with the process under which the designation was originally made. (d) Administrator prioritization discretion The Administrator may prioritize the establishment of a report under this section or a designation of the use of a class or subclass perfluoroalkyl or polyfluoroalkyl substances as a nonessential use or an essential use under subsection (c) in accordance with— (1) the National PFAS Testing Strategy of the Environmental Protection Agency (or a successor strategy)