but he vowed never to use harsh interrogation methods like waterboarding which trump has considered reviving. >> that's the debate in washington. that's not the debate here. there is no debate be here because we are grounded on safe and humane care and custody and will continue to be so. >> reporter: there will not be torture at guantanamo? >> i am confident there will not be torture at guantanamo. >> reporter: 21 of the remaining detainees have been cleared for release to other countries, but that leaves some of the most dangerous people still at guantanamo. the obama administration's plan for those risky prisoners, like 9/11 mastermind khaled sheikh mohammed, was to transfer them to high-security prisons in the u.s., but the republican-led congress blocked it. texas congressman mac thornberry: >> the fear is they will be a magnet for other terrorists to come and either try to break them out or just to punish the communities. >> reporter: lee wolosky, the administration's envoy for closing guantanamo, disagrees.