Let's start with this: If the president has the constitutional authority to do X, how can he be criminally liable for doing X? It seems rather obvious that he can't.

But if it's outside his constitutional authority, yes, he can be charged. That's what all the pearl-clutchers seem to be ignoring. Yes, Trump can be charged. He doesn't have immunity for election interference (outside the scope of his office). He doesn't have immunity for keeping and mishandling classified documents, and especially for trying to hide them (outside the scope of his role once out of office).

And what do you want? The Supreme Court laid down some general principles. Do you want them to judge how those principles apply to all the cases, when the lower courts haven't judged what the facts are yet? Why do you want that?

Look, I get as impatient as the next person at this slow-motion case, and I worry about November coming. But the Supreme Court isn't supposed to be a fact-finding court. Don't expect them to be.