Several congressional leaders have called on Biden to close the Guantanamo prison.

Starting with the "easy" prisoners is natural, but if the goal is to close the Guantanamo prison rather than just reduce the number of prisoners, that requires tackling the hard problem: the 10 prisoners who have somehow been charged. It will take decades for this problem will go away on its own, and that is too long, so let's get moving on it.

Some of them can be put on trial. One approach would be for Biden to demand, of Congress, "Authorize bringing them to the US for a real trial, or I will have to let them go. You've got six months to do it."

However, there are some who can't ever be put on trial because the US beat confessions out of them using torture. Those confessions are not valid proof of anything, because they are likely to be false. Indeed, one prisoner told the lies Dubya would want to hear, and thus tricked the US into attacking the wrong enemy.

Since the US can't try them, the US will have to let them go. If the US doesn't like this outcome, well, it should have thought about this before torturing them.