Daniel Fried, who is responsible for finding new homes around the world for Guantanamo detainees, says working out what to do with them is a "huge and complicated problem".
US President Barack Obama has pledged to close the prison at Guantanamo Bay by January 2010.
Fried, in his first interview about his Guantanamo job, spoke to the BBC's Jon Manel.
One-Minute World News 
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