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DES MOINES, IA - JANUARY 24:  Former Ambassador to the United Nations John Bolton speaks to guests  at the Iowa Freedom Summit on January 24, 2015 in Des Moines, Iowa. The summit is hosting a group of potential 2016 Republican presidential candidates to discuss core conservative principles ahead of the January 2016 Iowa Caucuses.  (Photo by Scott Olson/Getty Images)
DES MOINES, IA - JANUARY 24:  Former Ambassador to the United Nations John Bolton speaks to guests  at the Iowa Freedom Summit on January 24, 2015 in Des Moines, Iowa. The summit is hosting a group of potential 2016 Republican presidential candidates to discuss core conservative principles ahead of the January 2016 Iowa Caucuses.  (Photo by Scott Olson/Getty Images)

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Bolton: NK prisoners released 'without precondition'

On State of the Union, National Security Adviser John Bolton discusses his past comments on traveling to North Korea for the release of prisoners.

Bolton: NK prisoners released 'without precondition'

On State of the Union, National Security Adviser John Bolton discusses his past comments on traveling to North Korea for the release of prisoners.