The president's new order reverses one issued by Obama in his first days in office. During his campaign, Trump had promised to keep the facility open and to "load it up with some bad dudes."
The president also said he'd consider sending suspect Sayfullo Saipov to the Guantanamo Bay detention center, though he seemed to backtrack from this position in tweets Thursday.
President Obama recently announced a plan to close the prison at Guantanamo Bay, Cuba. Three people with close ties to the issue share their views on whether or not to close the detention center.