Three U.S. citizens are still detained in North Korea.
U.S. diplomat Joseph Yun was able to see them while in North Korea for the release of Otto Warmbier.
Warmbier was released this week through the efforts of U.S. diplomats.
While on a trip, the 22-year-old was accused with stealing a propaganda poster praising the North Korean dictator.
He returned to the United States in dire need of medical attention. He is in a coma and has severe brain tissue damage.
Doctors said he is unaware of his surroundings and unable to speak, understand language, or move.