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Nick Burns on Trump London terror tweet: Let them run their own show

3:36 PM ET Fri, 15 Sept 2017

CNBC Contributor Nick Burns and retired Lt. Col. Daniel Davis, senior fellow and military expert for Defense Priorities, discusses North Korea's economy after the U.S. imposed sanctions that have cut off 90% of trade for the country. They weigh in on the UK raising the terror threat level to critical.