gzt:
Trump breaking the law would not be needed. The Department of Justice has a longstanding policy that it does not prosecute sitting presidents, apparently.
Yes, that's a policy, but it is not the law. I would carry on; in the first instance if anyone mentioned the policy I would simply say that he wasn't a sitting president when he committed the crimes, he wasn't a sitting president when he was investigated, and he wasn't a sitting president when the prosecution began, therefore the policy does not apply. I would make them fire me.