II 115th CONGRESS 1st Session S. 612 IN THE SENATE OF THE UNITED STATES March 13, 2017 Mr. Flake (for himself and Mr. McCain ) introduced the following bill; which was read twice and referred to the Committee on Energy and Natural Resources A BILL To provide for the unencumbering of title to non-Federal land owned by the city of Tucson, Arizona, for purposes of economic development by conveyance of the Federal reversionary interest to the City.