Could European Populism Go Nuclear on NATO?

Before the recent North Atlantic Treaty Organization (NATO) summit, observers feared how President Donald J. Trump’s populist, illiberal tendencies could damage the transatlantic security relationship. These concerns proved true in many regards, but it would be wrong to assume that only U.S. populism could cause upheaval in the alliance. European politics matter too, especially in the areas that are most crucial to the Pentagon, like nuclear weapons.