Biden continued: "But, look, what the president said is that this is going to be hard. It's like opening Pandora's Box. We don't know what's inside the box."

He also said that "to the best of my knowledge" the number of prisoners "who are a real danger who are not able to returned or tried" has "not been established" by the Obama administration.

So he basically just confirmed his predecessor Dick Cheney's analysis that the decision was taken "with little deliberation, and no plan".

http://blogs.telegraph.co.uk/toby_harnden/blog/2009/05/22/out_of_the_loop_joe_biden_says_decision_to_shut_guantanamo_was_like_opening_pandoras_box_

Joe Biden the gift  that keeps giving