When in the petition process must the Secretary investigate a Tribe's compliance with a TERA?

§ 224.115 When in the petition process must the Secretary investigate a Tribe's compliance with a TERA? The Secretary must investigate the petitioner's claims of the Tribe's noncompliance with a TERA only after making a threshold determination that the petitioner is an interested party and: (a) The Tribe has denied or failed to respond to each claim made in the petition within the period under § 224.113(a); or (b) The Tribe has failed, refused, or was unable to cure or otherwise resolve each claim made in the petition within a reasonable period, as determined by the Secretary, after the expiration of the period in § 224.113(b). [73 FR 12821, Mar. 10, 2008, as amended at 84 FR 69613, Dec. 18, 2019]