"The next president will have to prioritize restoring our traditions of adherence to international legal regimes and norms. When I am President, America will reject torture without exception. America is the country that stood against that kind of behavior, and we will do so again. I also will reject a legal framework that does not work. There has been only one conviction at Guantanamo. It was for a guilty plea on material support for terrorism. The sentence was 9 months. There has not been one conviction of a terrorist act. As president, I will close Guantanamo, reject the Military Commissions Act, and adhere to the Geneva Conventions. Our Constitution and laws such as our Uniform Code of Military Justice provide a framework for dealing with the terrorists."
How quickly could most of this be done after 20 January? Just about instantly, I'd hope.