This is a stinking remnant from a time we should have put behind us when we transitioned from monarchies to republics. Of the course the fucking king is going to say that the king is immune, the fucking king had a divine right to rule. But we consent ourselves to be governed and we are not divine. This sovereign immunity has to go. How can there be checks and balances if the fucking judiciary cannot be used by the people to rein in the other branches?
This all reminds me of that game we play as kids. Tag, you're it. Except when you get to the base. Then you can't be it. It's fine in a bloody kids game but not in real life. If the game is rigged, you stop playing the game. I'm not advocating revolution, just deprecating the rules that make the playing field totally not level.