The treatment or mistreatment of refugees fleeing to Australia has been the wellspring of Australian politics for almost a quarter of a century.   This time, it's Peter Dutton with his call for Palestinians fleeing Gaza to be banned from coming to Australia. The language is designed to wedge the government by making them look soft on national security.  It comes at a time when ASIO has called for politicians to dial down the heated and divisive rhetoric consuming national conversations, with fear it could spark violence within the community.  Today, former Deputy Secretary of the Department of Immigration Abul Rizvi on how we screen refugees and why Peter Dutton’s ban makes no sense. Socials: Stay in touch with us on Twitter and Instagram Guest: Former Deputy Secretary of the Department of Immigration Abul Rizvi