to discuss the threat is boris epshteyn. what options are available if north korea continues to threaten the u.s.? boris: there are several options viable. option one is back channel diplomacy. secretary tillerson talked about that. option two is using china and russia. the allies of north korea to pressure north korea economically, politically and diplomatically to stand down. larry: your mention rex tillerson defended the president's comments but there is no sign that the threat level changed. is there a contradiction between the two? boris: boris: no. it's a mixture of messages. here is why. you want north korea to hear tough talk from the president. he ran on a tough stance against north korea. so secretary tillerson is saying if north korea is open to it and can get to the negotiation table the trump administration is open and willing to diffuse tensions. >> how have the past presidents handled north korea. how has the exchange been different from what they have done? >> a long line of failure. almost a war with north ko