subject to such terms as may be negotiated, authorize the tribe to plan, conduct, consolidate, and administer programs, services, functions, and activities, or portions thereof, administered by the Department of the Interior, other than through the Bureau of Indian Affairs, that are otherwise available to Indian tribes or Indians, as identified in
section 5372(c) of this title, except that nothing in this subsection may be construed to provide any tribe with a preference with respect to the opportunity of the tribe to administer programs, services, functions, and activities, or portions thereof, unless such preference is otherwise provided for by law; and