Excerpt:

This week, Secretary of State Rex Tillerson begins a trip to Asia, with scheduled visits to Japan, South Korea, and China.  Tensions have increased in the a region after North Korea recently conducted new tests of missiles, which North Korea says could carry nuclear warheads.

Former U.S. Sen. Sam Nunn, a Democrat from Georgia, is the co-chair and CEO of the Nuclear Threat Initiative. In part one of a conversation with Denis O'Hayer on "Morning Edition," Nunn talked about how serious a threat North Korea poses, and about the complicated diplomacy he says the new Trump administration must pursue to head off the possibility of a nuclear confrontation with that country.

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