45 CFR § 233.50 - Citizenship and alienage.
A State plan under title I (OAA); title IV-A (AFDC); title X (AB); title XIV (APTD); and title XVI (AABD-disabled) of the Social Security Act shall provide that an otherwise eligible individual, dependent child, or a caretaker relative or any other person whose needs are considered in determining the need of the child or relative claiming aid, must be either:
(a) A citizen, or
(b) An alien lawfully admitted for permanent residence or otherwise permanently residing in the United States under color of law, including certain aliens lawfully present in the United States as a result of the application of the following provisions of the Immigration and Nationality Act:
(1) Section 207(c), in effect after March 31, 1980 - Aliens Admitted as Refugees.
(2) Section 203(a)(7), in effect prior to April 1, 1980 - Individuals who were Granted Status as Conditional Entrant Refugees.
(3) Section 208 - Aliens Granted Political Asylum by the Attorney General.
(4) Section 212(d)(5) - Aliens Granted Temporary Parole Status by the Attorney General, or
(1) A Cuban and Haitian entrant as defined in paragraph (1) or (2)(A) of section 501(e) of Pub. L. 96-422, as in effect on April 1, 1983, or
(2) An adult assistance applicant for OAA, AB, APTD, or AABD, or
(3) An applicant for AFDC who is not a Cuban and Haitian applicant under paragraph (c)(1) of this section who was adjusted to lawful temporary resident status more than five years prior to application.