; or (B) an institution of higher education (as such term is defined in section 101(a) of the Higher Education Act of 1965 ( 20 U.S.C. 1001(a) )). (3) The term Indian school means a school that is operated by— (A) the Bureau of Indian Affairs; or (B) an Indian tribe, or an organization controlled or sanctioned by an Indian tribal government, for the children of that tribe under a contract with, or grant from, the Department of the Interior under the Indian Self-Determination Act or the Tribally Controlled Schools Act of 1988. (4) The term Indian tribe has the meaning given to that term in section 4(e) of the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 450b(e) ). (5) The term Secretary means the Secretary of Education. 8. Authorization of appropriations There are authorized to be appropriated such sums as may be necessary to carry out this Act, to remain available until expended, for each of fiscal years 2020 through 2024. Such authorization of appropriations shall be in addition to any other authorization of appropriations for Indian education.