25 C.F.R. § 170.4
How does this part affect existing Tribal rights?
This part does not:
(a) Affect Tribes' sovereign immunity from suit;
(b) Terminate or reduce the trust responsibility of the United States to Tribes or individual Indians;
(c) Require a Tribe to assume a program relating to the TTP; or
(d) Impede awards by other agencies of the United States or a State to Tribes to administer programs under any other law.