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Of which this world has never seen before. >> reporter: the president also taking to twitter, declaring he is considering launching an economic attack, "stopping all trade with any country doing business with north korea." >> and terry moran joins us from seoul now, and terry, we heard you report president trump has threatened to stop all trade with countries who trade with north korea. that would obviously include china, and they are responding tonight? >> reporter: they are, david. the chinese foreign ministry firing back, calling that threat unacceptable and unfair. and the analysts are poi...

Connect a miniaturized bomb to one of those missiles one day. let's talk about the strength of the bomb just tested by north korea. how strong is it? >> reporter: david, they have stepped up from a basic atomic weapon to a complex they remember nuclear device. they believe it's between five and eight times stronger than the bomb dropped on hiroshima in the end of world war ii. >> you told us how far those intercontinental ballistic missiles could feasibly go, the most recent going higher and further than before. what concerns you about the test of this nuclear bomb? >> reporter: david, it's th...

Look at this. this is what's called a ground base interceptor. if u.s. radars were able to detect a north korean launch, missiles would be launched from alaska and california, fly up into outer space. they would be able to tell the difference between a decoy warhead and the warhead itself, they would intercept it like a bullet on bullet, and prevent that nuclear warhead from hitting the united states. >> that is certainly the hope of how it would play out. colonel ganyard, let me ask you this, too. the president's words promising fire and fury like the world has never seen. afterward, kellyann...

Messages. now, a source here at the pentagon tells me today's false alert was a pure mistake by the hawaii emergency alert system. cecilia. >> stephanie ramos leading us off tonight, thank you. and while human error may be to blame, the chaos and confusion in hawaii today seemed to reveal a system not ready for the real thing. i want to bring in abc news contributor and retired marine colonel stephen ganyard. steve, as you have talked about so many times before, the threat from north korea obviously very real, but people today clearly did not know what to do. >> cecilia, this reaction, this pa...

Is that part of that threat? >> it's very real, david. intelligence analysts have been using satellite overhead imagery to look at this mountainous region where north korea conducts its underground tests. they declared it primed and ready to go. the next step is all up next to kim. >> all right, colonel ganyard with us. steve, thank you. next tonight here, the white house responding to protests across the country, demanding that president trump now that he's in white house release his tax returns. just as presidents have done for decades now. the protesters at those rallies say they are dete...