"I think all the president-elect is saying is that we have to be able to be - to keep ourselves safe and secure, and when others stop building their nuclear weapons, then we'll feel more secure in that regard."

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The biggest threat that we face right now is not a nuclear missile coming over the skies. It's in a suitcase. This is why the issue of nuclear proliferation is so important. It is the - the biggest threat to the United States is a terrorist getting their hands on nuclear weapons.

— Barack Obama