The US-Australia alliance has been a significant pillar in Australian foreign policy since 1951. The Trump Administration has urged a renewed focus on this relationship but, as Dr. Aiden Warren, Senior Lecturer and Researcher in RMIT's School of Global, Urban and Social Studies, will illustrate, the alliance also faces increased debate pertaining to a security challenges in the Indo-Pacific region, and within the US about the costs of global leadership. Such debates also need to take into account the tensions that derive fro the US's relationship with China, the region's strongest power.