; and (B) with respect to matters relating to the Thrift Savings Plan, be prescribed by the Executive Director. (2) Refunds Notwithstanding subsection (b), the regulations under paragraph (1)(A) shall, in the case of a Member who has not completed at least 5 years of civilian service creditable under section 8411 as of the date of enactment of this section, provide that the lump-sum credit shall be payable to such Member to the same extent and in the same manner as if such Member satisfied paragraphs (1) through (4) of section 8424(a) as of such date of enactment. (e) Exclusions For purposes of this section, the term Member does not include the Vice President. (f) Opt-In for Members Not later than 90 days after the date of enactment of this section, a Member covered by this chapter as of such date may elect, by giving notice in writing to the official that disburses the pay of such Member, to remain subject to this chapter. . (b) Clerical amendment The table of sections for chapter 84 of title 5, United States Code, is amended by inserting after the item relating to section 8425 the following: 8426. Termination of further retirement coverage of Members of Congress. . 4. Conforming amendment to TSP Section 8431(a) of title 5, United States Code, is amended by inserting except as provided in section 8335A(c) and section 8426(c), after subchapter, .