John McCain is not a fan of Obama closing the detainee facility:
Sen. John McCain (R., Ariz.) said that lawmakers will likely have to go to court with the Obama administration if the president uses executive action in his attempt to close the military prison at the Guantanamo Bay Naval Base in Cuba.
“Rumors are that he will act again in an unconstitutional manner,” McCain, a former prisoner of war, told Politico in an interview. “I think it’s unconstitutional. I think we’d have to go to court.”