membership (a) Number and appointment The Commission shall be comprised of 15 members appointed, in equal number, by the President, the Majority Leader of the Senate, the Minority Leader of the Senate, the Speaker of the House of Representatives, and the Minority Leader of the House of Representatives. (b) Chair The President shall select the Chair of the Commission. (c) Timing of appointments Appointments to the Commission shall be made not later than 30 days after the date of enactment of this Act. (d) Vacancies Any vacancy in the Commission shall not affect its powers and shall be filled in the manner in which the original appointment was made. (e) Compensation Members of the Commission shall serve without pay. (f) Travel expenses Each member of the Commission shall be allowed travel expenses, including per diem in lieu of subsistence, at rates authorized for employees of agencies under subchapter I of chapter 57 of title 5, United States Code, while away from their homes or regular places of business in the performance of services for the Commission.