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While President Donald Trump rattles sabers on Twitter and slams "Rocket Man" Kim Jong Un, there is also a perceptible hardening of tone among senior officials.
**This image is for use with this specific article only.**

While President Donald Trump rattles sabers on Twitter and slams "Rocket Man" Kim Jong Un, there is also a perceptible hardening of tone among senior officials.

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Trump: My nuclear button is bigger than Kim's

President Donald Trump responded to North Korean Leader Kim Jong Un with a tweet warning that his "nuclear button is on his desk at all times." Rep. Jim Himes discusses the tweet with CNN's Anderson Cooper.

Trump: My nuclear button is bigger than Kim's

President Donald Trump responded to North Korean Leader Kim Jong Un with a tweet warning that his "nuclear button is on his desk at all times." Rep. Jim Himes discusses the tweet with CNN's Anderson Cooper.