34 C.F.R. § 222.116
(b) In the written notice, the Assistant Secretary—
(2)
(c) The Assistant Secretary sends a copy of the written notice of intent to withhold payments to the LEA and the affected Indian tribe or tribes by certified mail with return receipt requested.
(Authority: 20 U.S.C. 7704 (a), (b), (d)(2), and (e) (8)-(9))