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And here, we observe him channeling Rumsfeld:
YOO ...needs to know what's legal and not legal. And sometimes, what's legal and not legal is not the same thing as what you can do or what you should do.
RUMSFELD ...as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns - - the ones we don't know we don't know.
He doesn't quite have it down yet, though.