"One of the things we've learned during the Obama era is how important norms are, because we've seen how the Republican Party behaved against Obama. So much of what they did was to smash pre-existing norms, which were nothing more than assumptions of how people would behave, which didn't have any real basis in rules or limits."

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There tends to be this comfortable assumption that nuclear weapons won't be used, but I don't think that's warranted, and I think we should seize the opportunity of this time of stability and cooperation and move towards global elimination of nuclear weapons as indeed people like Henry Kissinger, and William Perry, former Secretary of Defense under Clinton, and Sam Nunn, former Senator, and George Schultz, former Undersecretary of State for Ronald Reagan. All of them recently called for achievement of a nuclear weapon-free world.

— John Burroughs