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)