He should be fired immediately.
It was not sarcasm.
I think it was...and it wasn't. Let me explain. The tweet hit the nail on the head and these guys are loving the opportunity...so he did mean what he said. However, I think he said it thinking people would think he was being sarcastic and thus he could get away with it.
Now...what needs to happen is he needs to be MADE to apologize. The left ALWAYS says crazy stuff and is never held to account...unlike when the right just burps in the wrong direction.