II 115th CONGRESS 1st Session S. 638 IN THE SENATE OF THE UNITED STATES March 15, 2017 Mr. Portman (for himself, Ms. Stabenow , and Mr. Brown ) introduced the following bill; which was read twice and referred to the Committee on Finance A BILL To amend the Internal Revenue Code of 1986 to provide appropriate rules for the application of the deduction for income attributable to domestic production activities with respect to certain contract manufacturing or production arrangements.