agreements with the Bureau of Indian Affairs 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, including section 113 of title I of appendix C of Public Law 106–113 , if in fiscal year 2003 or 2004 a grantee received indirect and administrative costs pursuant to a distribution formula based on section 5(f) of Public Law 101–301 , the Secretary shall continue to distribute indirect and administrative cost funds to such grantee using the section 5(f) distribution formula. Bureau of Indian Education Operation of Indian Education Programs For expenses necessary for the operation of Indian Education programs, as authorized by law, including the Snyder Act of November 2, 1921 ( 25 U.S.C. 13 ), the Indian Self-Determination and Education Assistance Act of 1975 ( 25 U.S.C. 5301 et seq.), the Education Amendments of 1978 ( 25 U.S.C. 2001-2019 ), and the Tribally Controlled Schools Act of 1988 ( 25 U.S.C. 2501 et seq.), $1,000,233,000, to remain available until September 30, 2021, except as otherwise provided herein: Provided, That federally recognized Indian tribes and tribal organizations of federally recognized Indian tribes may use their Tribal priority allocations for unmet welfare assistance costs: Provided further, That not to exceed $721,690,000 for school operation costs of Bureau-funded schools and other education programs shall become available on July 1, 2020, and shall remain available until September 30, 2021: Provided further, That notwithstanding any other provision of law, including but not limited to the Indian Self-Determination Act of 1975 ( 25 U.S.C.