II 116th CONGRESS 1st Session S. 2662 IN THE SENATE OF THE UNITED STATES October 22, 2019 Mr. Barrasso (for himself, Mr. McConnell , Mr. Braun , Mrs. Capito , and Mr. Paul ) introduced the following bill; which was read twice and referred to the Committee on Environment and Public Works A BILL To amend sections 111, 169, and 171 of the Clean Air Act to clarify when a physical change in, or change in the method of operation of, a stationary source constitutes a modification or construction, and for other purposes.