He doesn’t need to give his name in order to be tried.
And from the picture, I seriously doubt he is an illegal. If you are so concerned with illegals, why don’t you do something about Utah’s sanctuary policies.
You are the one who is saying he has to conform to what the police want when there is a law that specifies he must have been brought before a magistrate already.
He was arrested on a simple trespass charge. They are holding him indefinitely on a MISDEMEANOR, and because he refuses to give in to ‘big brother’ and that is wrong. I have no doubt that many illegals are told to just ‘move along’ for things like that.
That is your OPINION. Your opinion runs counter to the Supreme Court, and the laws and state Constitution of Utah.
So, he's in jail, like a beligerant child, until he wants to conform to the laws and Constitution of this state. And again, he's free to simply say "My name is ...." and he can walk. If he wants to rot behind bars, this is his decision.