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To the president's re-election campaign efforts head into 2020. >> all right, thanks so much. let's go to jim sciutto now also covering the g-20 summit and this news conference. our chief security correspondent, and wanted to talk with you more about this overture by president trump to perhaps have a handshake at least with kim jong-un at the dmz when he areavrives in south korea. >> yes, and as with so many ideas, plans, announcements the president tweeting this out seemingly to the surprise of the north koreans. their official reaction at least was they had not received an official request, ...

Weapon, period. jim is with me now from washington. our chief security correspondent. in terms of a challenge for the secretary, how big of a challenge is this for him? >> it's a big challenge. you just heard the secretary there talk about the members of congress leaving with a sense of confidence. that's what's lacking here. they have no confidence that the iranian side will live up to their commitments. they say the only way to make that happen is keep their feet to the fire, in effect, by adding even more sanctions than there are today. as you say, they're getting that from both the republi...