Kim Dong Chul, a South Korean-born businessman and pastor, spent at least 900 days in custody after his October 2015 arrest on allegations he was trying to meet with a former North Korean soldier to receive classified information.
He also was accused of working with South Korea's spy agency, which denied any involvement. He had been sentenced to 10 years of hard labor in April 2016.
Kim Hak Song and Tony Kim both worked at the Pyongyang University of Science and Technology. They were arrested in 2017 and charged with "hostile acts" toward the North Korean state.
The three men, after meeting with Trump, were scheduled to travel to Walter Reed for a medical evaluation.
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