On New Year’s Day, the North Korean leader, Kim Jong-un, surprisingly called for direct talks with South Korea. How could that dialogue shift the dynamics among the North, the South and the United States? And Senator Orrin Hatch of Utah, the longest-serving Republican in the Senate, is retiring. Is the way open for Mitt Romney’s return? Guests: David E. Sanger, a Times correspondent who has covered North Korea’s missile program for decades; Jonathan Martin, a national correspondent.

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