If your visa application has been affirmed (unsuccessful) by the Administrative Appeals Tribunal (AAT), you can request Ministerial Intervention. Ministerial Intervention is a process whereby the Minister for Immigration can intervene in your case when the Minister thinks it is in the public interest to do so.
Unlike the Department of Immigration and Border Protection (DIBP) and the AAT, the Minister of Immigration is not bound by the rules and regulations of a visa. What is and what is not in the public interest is for the Minister to decide. The Minister is not legally bound to intervene or to consider intervening.
It is extremely important to request Ministerial Intervention prior to the expiry of your Bridging Visa to maintain your visa conditions.