If Senator Saunders invitation to the Vatican is to really address the creation of a moral global economy , then, from my perspective, a primary focus of Senator Sanders presentation would be on the revocation of the Papal Bulls that resulted in the Doctrine of Discovery which gave "Christion Nations" the Divine Right to Colonize all Non-Christians, world-wide!
The $ Trillions in restitution that would ultimately be realized from the full resolution of this global injustice would go a long way in balancing the extremes of global wealth and poverty that are a direct result of the Papal Bulls and the Doctrine of Discovery!