; or (ii) submit the initial report under subparagraph (B). (B) Reports If the Secretary does not issue proposed regulations by the deadline established in subparagraph (A), the Secretary shall submit to the Committees on Veterans’ Affairs of the House of Representatives and the Senate a report on the status of such proposed regulations. On a quarterly basis thereafter until the date on which the Secretary issues such proposed regulations, the Secretary shall submit to such committees an update on such status. (2) Final regulations Not later than 180 days after the date on which the Secretary issues any proposed regulations under this subsection, the Secretary shall prescribe final regulations. Such regulations shall be effective on the date of issuance. (3) Presumption not warranted (A) Publication If the Secretary determines under subsection (a) that a presumption of service connection is not warranted for an illness, or proposes to remove a previously established presumption, the Secretary shall publish in the Federal Register a notice of that determination not later than 180 days after making the determination. The notice shall include an explanation of the evidence and scientific basis for that determination. (B) Removal of previous presumption If an illness already presumed to be service connected under this section is subject to a notice published under subparagraph (A), the Secretary shall issue proposed regulations removing the presumption for the illness not later than 180 days after publication of such notice. (4) Effect of removal Whenever the presumption of service connection for an illness under this section is removed under this subsection— (A) a veteran who was awarded compensation for the illness on the basis of the presumption before the effective date of the removal of the presumption shall continue to be entitled to receive compensation on that basis