"It's very intimidating looking at the script and realizing that you have to say medical jargon as if you've said them a million times before, and they're just a part of your vocabulary. But that's what preparing is for, and you can't just really wing it. You've got to really know what you're doing."

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I would consider the principal threats to start with Russia, and it would certainly include any nations that are looking to intimidate nations around their periphery, regional nations nearby them, whether it be with weapons of mass destruction or, I would call it, unusual, unorthodox means of intimidating them, that sort of thing.

— James Mattis