; and (2) in the case of the Senate, the Secretary of the Senate, or an employee of the Office of the Secretary of the Senate who is designated by the Secretary to carry out this Act. 4. Definitions In this Act— (1) the term mass shooting means 4 or more injuries in a single incident by the use of a firearm (as defined in section 921 of title 18, United States Code); and (2) the term Member of Congress means an individual serving in a position under subparagraph (A), (B), or (C) of section 601(a) of the Legislative Reorganization Act of 1946 ( 2 U.S.C. 4501 ).