The United States and North Korea have set up working groups to discuss ways to rid Pyongyang of its nuclear weapons, a U.S. official said Saturday, the second day of a two-day trip to Pyongyang by Secretary of State Mike Pompeo.The working groups will deal with details such as verification to achieve denuclearization, State Department spokeswoman Heather Nauert said, according to a pool report by U.S. reporters accompanying Pompeo.Pompeo held three hours of talks Friday with Kim Yong Chol, a vice chairman of the Central Committee of the Workers' Party of Korea, to nail down specifics about…READ FULL ARTICLE