Romney, who voted to convict Trump in both impeachments, said Biden should pardon his opponent so the country doesn’t have to go through the prosecution of an ex-president.
Louis XVI was prosecuted and found guilty of high treason and crimes against the state by the National Convention during the French revolution, so it does happen from time to time.
I understand the sentiment, but I hate this phrase. If any of the e.g. Scandinavian royals would exhibit this kind of behaviour and lawlessness, the monarchy would be dismantled in a heartbeat. It's mostly for show, and the monarchy only exists for as long as the people want it to.