There is no case law. This decision will be based on the original constitution That is why only the SCOTUS can hear the case on its merits.
For Cruz? There certainly is! He's naturalized, slam dunk if the law is applied.
Any court that want to can decide the case on the merits. You see, the dirty secret is that lower courts do not have to collow the law, becuase they have appellate courts to correct errors. Lower courts make mistakes ON PURPOSE, sometimes out of spite for the losing party.
I do agree that the only court ruling that has effect across the whole country is SCOTUS.