No he shouldn’t be involved with a 17 year old, if he was.
But the criminal investigation calling it interstate sex trafficking is an obvious political hit job.
The relationship isn’t illegal and buying someone dinner on a trip isn’t sex trafficking.
Why would Barr initiate the investigation?
Banging an underage girl after traveling into multiple states has the risk of breaking all sorts of laws. Every state has age if consent, plus federal laws. Should have kept clear.