There's no physical button, but there is a "football" and "biscuit".
Read more about Trump's taunting tweet on Vox.com here: http://bit.ly/2EpdQED.
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Just a week into 2018, Donald Trump tweeted a provocative message directed at the North Korean regime's leader, Kim Jong Un. His message cited a "nuclear button", and claimed that his was much larger than Kim's. But how does the U.S. protocol for launching nuclear warheads actually work? It's a process that's designed to be fast - there are only a few steps. But it's still more complicated than a simple button.
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