Every so often there is a tectonic shift in American foreign policy -- a fundamental turning point marked by new ways of approaching the world. The post-World War II era of institution-building, the Cold War period of competition and militarization, and the 9/11 global war on terrorism are examples.

Has the return of President Trump ushered in one of these historic turning points? What are the radical foreign policy changes he has pursued so far? Are they likely to be temporary or enduring? And what are the consequences for the United States and the world community?

In this broadcast of "Talking Foreign Policy," host Michael Scharf has assembled a group of leading international law and policy experts to answer these questions