; (ii) at least 2 shall be members appointed by the minority leader of the House of Representatives; (iii) at least one shall be one of the members appointed by the majority leader of the Senate; and (iv) at least one shall be one of the members appointed by the minority leader of the Senate. (2) Deadline for appointment The appointing authorities under paragraph (1) shall appoint the members of the commission not later than 30 days after the President transmits to Congress the statement showing the number of Representatives to which each State is entitled under section 22(a) of the Act entitled An Act to provide for the fifteenth and subsequent decennial census and to provide for apportionment of Representatives in Congress , approved June 18, 1929 ( 2 U.S.C. 2a(a) ), as amended by section 2(a). (3) Qualifications In appointing members of the commission, the appointing authorities under paragraph (1) shall prioritize the appointment of individuals who are qualified to assess the appropriate number of Members of the House of Representatives because of their expertise or study of politics, government, and related fields, and their demonstrated ability to work in a nonpartisan manner. (4) Vacancy A vacancy in the commission shall be filled in the same manner as the original appointment was made. (5) Compensation Members of the commission— (A) shall be paid the daily equivalent of the annual rate of basic pay payable for level V of the Executive Schedule for each day (including travel time) during which the member is engaged in the actual performance of duties vested in the commission