; (B) understands and is attached to the principles of the Constitution of the United States; or (C) is well disposed to the good order and happiness of the United States. . (c) Effective date; application The amendments made by this section— (1) shall take effect on the date of the enactment of this Act; (2) shall apply to any act that occurred before, on, or after such date of enactment; and (3) shall apply to any application for naturalization or any other case or matter under the immigration laws that is pending on, or filed after, such date of enactment. 1625. Clarification of denaturalization authority Section 340 of the Immigration and Nationality Act ( 8 U.S.C. 1451 ) is amended— (1) in subsection (a), by striking United States attorneys for the respective districts and inserting Attorney General ; and (2) by amending subsection (c) to read as follows: (c) The Government shall have the burden of proof to establish, by clear, unequivocal, and convincing evidence, that an order granting citizenship to an alien should be revoked and a certificate of naturalization cancelled because such order and certificate were illegally procured or were procured by concealment of a material fact or by willful misrepresentation. . 1626. Denaturalization of terrorists (a) Denaturalization for terrorists activities Section 340 of the Immigration and Nationality Act, as amended by section 1625, is further amended— (1) by redesignating subsections (d) through (h) as subsections (f) through (j), respectively; and (2) by inserting after subsection (c) the following: (d) (1) If a person who has been naturalized, during the 15-year period after such naturalization, participates in any act described in paragraph (2)— (A) such act shall be considered prima facie evidence that such person was not attached to the principles of the Constitution of the United States and was not well disposed to the good order and happiness of the United States at the time of naturalization