Diplomats at the United Nations will soon hold formal hearings with the current candidates for the organization’s next secretary-general. They will discuss topics ranging from climate change to human rights. But many participants will be listening most closely to what the would-be leaders have to say about the U.N.’s mandate to maintain international peace and security. Both the U.N.’s current secretary-general, António Guterres, and its member states have downplayed peace and security in