The interview I cited didn't say where, explicitly; what he said was that arrangements had been made by the State Department and it was the White House holding

The interview I cited didn't say where, explicitly; what he said was that arrangements had been made by the State Department and it was the White House holding things back. I'd like to know the answer to your question too, but I'm hesitant to accept the "there's nowhere to send them" meme, which one hears often, without something to distinguish it as fact rather than propaganda. For example, another often-repeated meme, "these are the worst of the worst", is apparently entirely untrue in these 86 cases. (Even the half dozen prisoners who have actually been tried were apparently mostly just cooks and drivers and such.)