They could easily vacate a federal prison and use it exclusively for the inmates at Guantanamo. Why should we pay over a hundred thousand per prisoner in Gitmo when in the US it would be every bit as secure and cost perhaps a third or less?
God does not design our prisons with any specific intent, nor does the Constitution say a thing about it.
Of course, holding prisoners with no trial and no charges... THAT the Constitution DOES address.
Obama is 100% right, and Tom Cotton should be off managing a Piggley Wiggley in Arkadelphia.