NATO leaders are gathering in Washington this week as the military alliance celebrates its 75th anniversary, confronts the prospect of the return of NATO skeptic Donald Trump to the White House, the Ukraine war, and a bigger global role. We talk to Charles Kupchan is a senior fellow at the Council on Foreign Relations (CFR) and professor of international affairs at Georgetown University. Heavy Israeli bombardment is shaking Gaza City. Thousands of fleeing Palestinians are searching for shelter, and medical facilities have been forced to shut down.