As NATO marks its 70th anniversary this week, the world's preeminent military alliance faces threats from the backsliding governments of some member states as well as attacks by US President Donald Trump. Former NATO Deputy Secretary General Alexander Vershbow joins Greg to discuss the danger to the alliance from inside, as well as its external challenges from Russia, China and elsewhere, and how NATO must adapt in the future.

First, Susan and Greg discuss other events of the past week, including elections in Ukraine and Slovakia and the latest in Brexit madness.