The good news is that unlike The Land Of The Free we have freedom of speech in this country.
You can expect the stupid twat will be faced with protest and ridicule and people doing their utmost to demonstrate to him what a total cunt he is.
And so long as it's non-violent they will be allowed to do it, no matter how much the American secret services sulk.
I'm not a monarchist, but I am thankful that though the queen will be obliged to host a reception for him, she will also make it clear that she thinks he's a peace of shit as well - aloofness, cold-shoulders, condescension. It will all be very formal and polite, but far from warm and friendly.
Frankly, I don't know why he's bothering.