The Supreme Court released its opinion in Murphy v. NCAA today, holding that Congress cannot force states to prohibit sports betting. If Congress wants to make sports betting illegal under Federal law, fine. But Congress does not have authority to commandeer state law for that purpose. Three liberal justices dissented on other issues, but the decision was unanimous on the core anti-commandeering question. This case has huge implications for whether the Federal government can force states to cooperate in immigration enforcement. I always though SCOTUS would side with the sanctuary cities on that issue, but now I'm thinking it will be unanimous. Note that this has nothing to do with whether sanctuary cities are a good idea -- just whether the Federal government can legally stop them.