Here:

US Cert Opp Brief

An excerpt:

Petitioner contends (Pet. 11-22) that the Ninth Circuit’s definition of an “Indian” for purposes of 18 U.S.C. 1153 violates equal protection. Petitioner further asserts (Pet. 22-23) that the Ninth Circuit’s decision conflicts with a decision from the Utah Supreme Court. Those claims lack merit. The court of appeals’ decision – which follows this Court’s precedent – is fully consistent with the Constitution, and no conflict exists on the question presented. Moreover, this case would be a poor vehicle to consider the meaning of “Indian” in Section 1153 because petitioner qualifies under any conceivable definition, including the one he proposes. Further review is not warranted.

Cert petition is here.