Here are the briefs in United States v. Gordon:

Ok, so there’s only that brief so far. Also, since the defendant stipulated to tribal membership with Nez Perce, I doubt this has legs, but it’s the kind of full-throated attack on the Indian status cases arising under the Indian country criminal jurisdiction statutes that we should expect more regularly — i.e., the kind that relies a LOT on single-authored concurrences and dissents from a certain SCT Justice that tends to rely on discredited historical research.

Here’s the lower court judgment (nothing terribly helpful here since the defendant stipulated to tribal membership):