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Does President Trump really have a nuclear button on his desk?

US President Donald Trump has boasted that his nuclear button is "much bigger" and "more powerful" than North Korean leader Kim Jong-un's.

Unsurprisingly, the comments made quite a stir on social media. But, is there actually such a thing as a button allowing a President to single-handedly initiate a nuclear launch?

Krister Knapp, a senior lecturer in history at Washington University explains...

(Photo: A red button. Credit: Getty Images)

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