Any Indian tribe which became subject to State jurisdiction pursuant to the provisions of the Act of August 15, 1953 (67 Stat. 588), as amended by title IV of the Act of April 11, 1968 (82 Stat. 73, 78), or pursuant to any other Federal law, may reassume jurisdiction over child custody proceedings. Before any Indian tribe may reassume jurisdiction over Indian child custody proceedings, such tribe shall present to the Secretary for approval a petition to reassume such jurisdiction which includes a suitable plan to exercise such jurisdiction.
If the Secretary approves any petition under subsection (a), the Secretary shall publish notice of such approval in the Federal Register and shall notify the affected State or States of such approval. The Indian tribe concerned shall reassume jurisdiction sixty days after publication in the Federal Register of notice of approval. If the Secretary disapproves any petition under subsection (a), the Secretary shall provide such technical assistance as may be necessary to enable the tribe to correct any deficiency which the Secretary identified as a cause for disapproval.
Assumption of jurisdiction under this section shall not affect any action or proceeding over which a court has already assumed jurisdiction, except as may be provided pursuant to any agreement under section 1919 of this title.