believed to be capable of hitting mainland america. it comes after they conducted two nuclear tests in 20 116. china and south korea have both denounced the plans and donald trump tweeted the following. north korea just stated it is in the final stages capable of reaching parts of the u.s. it won't happen. what could he do? joining me here in new york is president of the n non-proliferation advocacy group. he joins us from the center for strategic and international studies. what do you make of north korean capabilities and threats/promise? >> they could be if they keep