; and (2) by adding at the end the following: (I) Failure to register as a sex offender Any alien convicted of, or who admits having committed, or who admits committing acts which constitute the essential elements of a violation of section 2250 of title 18, United States Code (relating to failure to register as a sex offender) is deportable. . (c) Effective date The amendments made by this section shall take effect on the date of the enactment of this Act and shall apply to acts that occur before, on, or after the date of the enactment of this Act. 320. Protecting immigrants from convicted sex offenders (a) Immigrants Section 204(a)(1) of the Immigration and Nationality Act ( 8 U.S.C. 1154(a)(1) ), is amended— (1) in subparagraph (A), by amending clause (viii) to read as follows: (viii) Clause (i) shall not apply to a citizen of the United States who has been convicted of an offense described in subparagraph (A), (I), or (K) of section 101(a)(43), unless the Secretary of Homeland Security, in the Secretary's sole and unreviewable discretion, determines that the citizen poses no risk to the alien with respect to whom a petition described in clause (i) is filed. ; and (2) in subparagraph (B)(i)— (A) by redesignating the second subclause (I) as subclause (II)