This has been covered before, but let's review this again...
The fault for not closing Guantanamo Prison is with Obama and his firm control of Congress, with Democrats in control of both houses for 2 full years, 2009 - 2010.
Our constitutional law professor-turned president used his "I will close Guantanamo Prison" as an applause line in every speech he delivered, 2007 - 08, and it helped him get elected.
Once inaugurated, he didn't lift a finger to close Guantanamo Prison, and deal justly with the prisoners there.
His ineffective leadership cost Democrats control of Congress in 2010, and with each subsequent election, the party has fared worse.
Blame Repubs for a lot of bad US politics -- I do!-- but not for obstructing the closing of Guantanamo Prison.