主播大秀

Stephen Sackur speaks to John Negroponte, a veteran US diplomat and adviser to a host of Republican presidents. Donald Trump embraces disruption and unpredictability, but what does that mean for America's national security and foreign policy? At first glance it seems to herald a new era of confrontation, from the Korean peninsula to the Mexican border, but are there limits to the president's break with convention? Does this presidency mark a permanent shift in America's global role?