(a) A Tribe may apply for the Program at any time, but nothing in this part requires a Tribe to do so.

(b) A Tribe's decision to participate in the Program does not:

(1) Affect, modify, diminish, or otherwise impair the sovereign immunity from suit enjoyed by the Tribe;

(2) Terminate, waive, modify, or reduce the trust responsibility of the United States to the Tribe or individual Indians; or

(3) Reduce the amount of the Tribe's formula or discretionary funding from the Department or impair the Tribe's ability to obtain funding from another Federal program.