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SEOUL, SOUTH KOREA - JANUARY 06:  South Korean watch a television broadcast reporting the North Korea's Hydrogen Bomb Test at the Seoul Railway Station on January 6, 2016 in Seoul, South Korea. North Korea confirmed it has conducted a hydrogen bomb test after South Korea's Metrological Administration detected an 'artificial earthquake' near  Punggye-ri, North Korea's main nuclear testing site on January 6, 2015.  (Photo by Chung Sung-Jun/Getty Images)
SEOUL, SOUTH KOREA - JANUARY 06:  South Korean watch a television broadcast reporting the North Korea's Hydrogen Bomb Test at the Seoul Railway Station on January 6, 2016 in Seoul, South Korea. North Korea confirmed it has conducted a hydrogen bomb test after South Korea's Metrological Administration detected an 'artificial earthquake' near  Punggye-ri, North Korea's main nuclear testing site on January 6, 2015.  (Photo by Chung Sung-Jun/Getty Images)

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CNN's John Vause speaks with former U.S. ambassador to South Korea about North Korea having a hydrogen bomb.

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CNN's John Vause speaks with former U.S. ambassador to South Korea about North Korea having a hydrogen bomb.