FILE - In this April 29, 2016, file photo, Kim Dong Chul, center, a U.S. citizen detained in North Korea, is escorted to his trial in Pyongyang, North Korea. U.S. Secretary of State Mike Pompeo has left North Korea with three American detainees, one of them Kim Dong Chul, who were released ahead of an upcoming meeting between President Donald Trump and North Korean leader Kim Jong Un, the U.S. president said in a tweet Wednesday.(AP Photo/Kim Kwang Hyon, File)