Among the many unknowns hanging over this presidential transition: the fate of the U.S. military prison at Guantanamo Bay, Cuba. President Obama has sworn to close it; President-elect Trump wants to fill it up again.
Obama has been promising the closure will happen since his second day in office in 2009. In February, he repeated that pledge one more time, saying, "I'm absolutely committed to closing the detention facility at Guantanamo."
That same day, at a campaign rally in Sparks, Nevada, Donald Trump was promising the opposite.
"This morning, I watched President Obama talking about Gitmo, right, Guantanamo Bay, which by the way, which by the way, we are keeping open. Which we are keeping open ... and we're gonna load it up with some bad dudes, believe me, we're gonna load it up."
But, says Ben Wittes, editor-in-chief of the national security blog Lawfare, "You have to ask the question, with whom?"
Because the U.S. is not fighting ground wars and taking prisoners like it once did, Wittes wonders just how Trump expects to load up Guantanamo with "bad dudes."
"Trump's stated military strategy and ambition are so hard to figure out that it's not at all clear to me what the captive population that would be subject to being moved to Guantanamo [is], who they would be or where they would come from," he says.
If it were up to Trump, those suspects might actually come from the United States. Asked last summer by the Miami Herald if Americans accused of terrorism should be tried by military commissions in Guantanamo, Trump endorsed such a policy.
"I know that they want to try them in our regular court systems, and I don't like that at all. I don't like that at all. I would say they could be tried there, that'll be fine," he said.
Under current law, American citizens cannot, in fact, be held in Guantanamo, much less tried there. Meanwhile, proponents of closing Guantanamo are demanding Obama fulfill his promise before Trump takes over. One online video counting down the days Obama has left features a new anthem with the refrain "Close Guantanamo, close Guantanamo."
Of the 242 captives in Guantanamo when Obama took office, 60 remain, a third of them approved for release. But Rosa Brooks, a Georgetown University constitutional law professor and former Pentagon official, says that number could quickly be reduced to zero.
"If President Obama wanted to close Guantanamo tomorrow," she says, "he could do it."
Obama, she says, should simply ignore the ban Congress has imposed on sending any Guantanamo detainees to the U.S. for detention or trial.
"If I were President Obama and I wanted to close Guantanamo, I would say, I regard this particular limitation as an unconstitutional infringement on my inherent powers as commander in chief. You know, thank you for your input, Congress, but I'm doin' it."
Wittes, for his part, doubts that will happen.
"Closing Guantanamo is clearly something the president very much wanted to do and he's never been willing to defy the acts of Congress on this, and I think that's because his administration actually doesn't believe it has the authority to do that. I don't think that's changed because Donald Trump has been elected."
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