; and (B) in the case of complaints upon which the Federal Election Commission failed to act, with respect to complaints which were filed on or after the date of the enactment of this Act. (c) Regulations Not later than 180 days after the date of the enactment of this Act, the Federal Election Commission shall promulgate new regulations on the enforcement process under section 309 of the Federal Election Campaign Act of 1971 ( 52 U.S.C. 30109 ) to take into account the amendments made by this section. 7103. Official exercising the responsibilities of the general counsel Section 306(f)(1) of the Federal Election Campaign Act of 1971 ( 52 U.S.C. 30106(f)(1) ) is amended by adding at the end the following new sentence: In the event of a vacancy in the position of the General Counsel, the most senior attorney employed within the Office of the General Counsel at the time the vacancy arises shall exercise all the responsibilities of the General Counsel until the vacancy is filled. . 7104. Permitting appearance at hearings on requests for advisory opinions by persons opposing the requests (a) In general Section 308 of such Act ( 52 U.S.C. 30108 ) is amended by adding at the end the following new subsection: (e) To the extent that the Commission provides an opportunity for a person requesting an advisory opinion under this section (or counsel for such person) to appear before the Commission to present testimony in support of the request, and the person (or counsel) accepts such opportunity, the Commission shall provide a reasonable opportunity for an interested party who submitted written comments under subsection (d) in response to the request (or counsel for such interested party) to appear before the Commission to present testimony in response to the request. . (b) Effective da te The amendment made by subsection (a) shall apply with respect to requests for advisory opinions under section 308 of the Federal Election Campaign Act of 1971 which are made on or after the date of the enactment of this Act. 7105. Permanent