re: two-party consent, IANAL but there seems to be exceptions where if the parties don't have a reasonable expectation of privacy, consent is not needed. For example, somebody recording you giving a public speech does not need your permission -- the public can go hear you speak with or without the recording.

Since Trump was mic'd up on the bus (they were going to film a segment), I think there is a case to be made that he couldn't realistically make the case he didn't know he was being recorded or could be recorded. I think it'd be a hard sell that this was an illegally recorded conversation.