; and (bb) a vacancy in the Fiscal Commission exists. (4) Administration (A) In general With respect to the Fiscal Commission, to enable the Fiscal Commission to exercise the powers, functions, and duties of the Fiscal Commission, there are authorized to be disbursed by the Senate the actual and necessary expenses of the Fiscal Commission approved by the co-chairs of the Fiscal Commission, subject to the rules and regulations of the Senate. (B) Expenses With respect to the Fiscal Commission, in carrying out the functions of the Fiscal Commission, the Fiscal Commission is authorized to incur expenses in the same manner and under the same conditions as the Joint Economic Committee is authorized under section 11(d) of the Employment Act of 1946 ( 15 U.S.C. 1024(d) ). (C) Quorum With respect to the Fiscal Commission, 9 members of the Fiscal Commission shall constitute a quorum for purposes of voting, meeting, and holding hearings. (D) Voting (i) Proxy voting No proxy voting shall be allowed on behalf of any member of the Fiscal Commission. (ii) Congressional budget office estimates (I) In general The Director of the Congressional Budget Office shall, with respect to the legislative language of the Fiscal Commission under paragraph (2)(B)(i)(II), provide to the Fiscal Commission— (aa) estimates of the legislative language in accordance with sections 308(a) and 201(f) of the Congressional Budget Act of 1974 ( 2 U.S.C. 639(a) and 601(f))