The "principle" he's fighting for had already been fully vetted by the justice system. He didn't have a leg to stand on, and any competent lawyer would have told him so. His position is literally "your laws don't apply to me."
A mixed record? He has literally lost every single argument he's made, most of which had already been thoroughly litigated in prior. The very few novel arguments he's made were just legal fanfic like "well I have rights because of Mexican law before California became part of the US."
