Wickard v. Filburn was about the federal legislature's jurisdiction under the Commerce Clause: https://matthewminer.name/law/briefs/2L/1st+Semester/LAW+531-001+

Wickard v. Filburn was about the federal legislature's jurisdiction under the Commerce Clause: https://matthewminer.name/law/briefs/2L/1st+Semester/LAW+531-001+%E2%80%93+Constitutional+Law+I/Wickard+v.+Filburn https://matthewminer.name/law/briefs/2L/1st+Semester/LAW+531... Presumably automakers are suing California for the inverse thereof—the Dormant Commerce Clause—à la Southern Pacific Co. v. Arizona, saying such authority is actually reserved exclusively to the federal government as an exception to states' general police powers: https://en.wikipedia.org/wiki/Dormant_Commerce_Clause https://en.wikipedia.org/wiki/Dormant_Commerce_Clause