In a new interview with GZERO World host Ian Bremmer, conducted on the eve of the 2020 General Assembly, UN Secretary-General António Guterres confronts the challenges of leading a multilateral organization in an increasingly nationalistic world. "I am not naïve," he tells Bremmer. "I know this is going to be a very tough ideological battle."

Watch the episode: UN Secretary-General António Guterres: Why we still need the United Nations