under the provisions of the Indian Self-Determination Act or the Tribal Self-Governance Act of 1994 (Public Law 103–413). In the event any tribe returns appropriations made available by this Act to the Bureau of Indian Affairs, this action shall not diminish the Federal Government’s trust responsibility to that tribe, or the government-to-government relationship between the United States and that tribe, or that tribe’s ability to access future appropriations. Notwithstanding any other provision of law, no funds available to the Bureau of Indian Education, other than the amounts provided herein for assistance to public schools under 25 U.S.C. 452 et seq., shall be available to support the operation of any elementary or secondary school in the State of Alaska. No funds available to the Bureau of Indian Education shall be used to support expanded grades for any school or dormitory beyond the grade structure in place or approved by the Secretary of the Interior at each school in the Bureau of Indian Education school system as of October 1, 1995, except that the Secretary of the Interior may waive this prohibition to support expansion of up to one additional grade when the Secretary determines such waiver is needed to support accomplishment of the mission of the Bureau of Indian Education, or more than one grade to expand the elementary grade structure for Bureau-funded schools with a K-2 grade structure on October 1, 1996. Appropriations made available in this or any prior Act for schools funded by the Bureau shall be available, in accordance with the Bureau’s funding formula, only to the schools in the Bureau school system as of September 1, 1996, and to any school or school program that was reinstated in fiscal year 2012. Funds made available under this Act may not be used to establish a charter school at a Bureau-funded school (as that term is defined in section 1141 of the Education Amendments of 1978 (25 U.S.C. 2021)), except that a charter school that is in existence on the date of the enactment of this Act