How do these regulations affect existing Tribal rights?
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
Nothing in these regulations may be construed as:
(a) Affecting, modifying, diminishing, or otherwise impairing the sovereign immunity from suit enjoyed by an Indian Tribe;
(b) Authorizing or requiring the termination, waiving, modifying, or reducing of any existing trust responsibility of the United States with respect to the Indian people;
(c) Permitting significant reduction in services to Indian people as a result of this part; or
(d) Mandating an Indian Tribe to request a contract or contracts. Such requests are strictly voluntary.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.