Seperation of church and state?
How does that possible apply? The Pope’s being invited to vist not take the joint over for crying out loud!!!
Actually, it's "separation of church FROM state". Delivering an address is not the same as an endorsement of one religion over another. Over the decades, popes have been invited to address the United Nations. They are all warmly received and their messages promptly ignored. No doubt the US Congress would respond in a similar manner.