In addition to the authority of the Secretary under section
1616e
(a)(1) of this title, the Secretary, acting through the Service, is authorized to provide grants to public or private schools of nursing for the purpose of establishing, developing, operating, and administering clinics to address the health care needs of Indians, and to provide primary health care services to Indians who reside on or within 50 miles of Indian country, as defined in section
1151 of title
18.