NEW YORK, NY - APRIL 28: US Secretary of State Rex Tillerson (L) and US Ambassador to the UN Nikki Haley (R) listen as China's Foreign Minister Wang Yi speaks during a security council meeting on nonproliferation of North Korea at United Nations on April 28, 2017 in New York City.  The growing threat of nuclear North Korea is going to be the focus for Secretary of State Rex Tillerson while he chairs a special meeting of the United Nations Security Council.. (Photo by Eduardo Munoz Alvarez/Getty Images)