judicial or administrative proceeding has previously been invoked to resolve such complaint, the Secretary of Labor shall investigate the complaint and, upon completion of such investigation, submit a report to the individual submitting the complaint, the applicable non-Federal employer, the head of the appropriate agency, Congress, the Congressional Oversight Committee, the Special Inspector General for Pandemic Relief (as appropriate), any appropriate inspector general, and the Pandemic Response Accountability Committee detailing the findings of the investigation. (D) Occupational safety and health administration The Secretary of Labor shall ensure that investigations of complaints under this subsection are carried out by the Assistant Secretary for Occupational Safety and Health, which may be through a whistleblower protection program or office of the Occupational Safety and Health Administration. (2) Time limitations for actions (A) In general Except as provided under subparagraph (B), not later than 180 days after receiving a complaint under paragraph (1), the Secretary of Labor shall— (i) make a determination that the complaint is frivolous, does not relate to covered funds, or another Federal or State judicial or administrative proceeding previously has been invoked to resolve such complaint