No, it wouldn’t. He would claim diplomatic immunity, the British would (could) never hold him, and he couldn’t be held to account in the USA now!
Think for a minute what you are saying? The UK would jail the leader of their largest and staunchest ally, who is not only in charge of the military, but protected at all times by a phalanx of armed guards who vow to take a bullet for him?? Seriously?
If you think the 1770s were bad, try enacting a coup d’etat of theUSA on British soil and watch what happens!
You couldn’t even snag your own politicians in Operation Yewtree, but you’re going to snag the POTUS? LOL!!!