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Years about the suitcase bombs, the backpack bombs? is that the kind of thing this loose nuclear material out there constitutes? >> right. well, they're actually talking about detonating a nuclear weapon. not the dirty bomb that has the radioactive material that can be exploded and sort of spread and carried by the wind and do some damage in an immediate area. they're talking about an explosion, a detonation. it's really quite sobering talk, and again, the justification for this unprecedented meeting in washington in the coming days, alex. >> mike viqueira at the white house. mike, thanks so m...

Possibility of suitcase bombs and backpack bombs. is that the kind of material you're talking about? >> yeah, exactly. the united states and russia have 90% of the world's nuclear material. and of course when the soviet union broke up, there was a lot of concern about what happened to the soviet nuclear stockpile. so keeping track of all of the missing pieces, things that have, you know, landed in soviet socialist -- former soviet sociali socialist republics, things like that, each country is going to face different challenges based on how they were involved in things like that. >> you know, k...

The same question, how do we manage to avoid attacks so far? >> reporter: a lot of credit goes to police work. in new york city alone, they foiled five plots against transit systems since 1997, the most recent, many people obviously remember najibullah zazi who authorities say was plotting to put eight backpack bombs on new york city's subway cars. police used a variety of tactics to thwart the attacks, including the surge that we saw in new york city this morning, where hundreds of heavily armed police officers swarmed subway and train stations. this can act as a deterrent, since terror attac...

Why? >> that is what i want to know. for what? the problem that i don't understand, we have presidents coming to this town all the time. we don't shut down. when a president comes here we should down one block. megyn: the difference between that . we have a much bigger security package for an him. we're going to have a big frozen area. someone with a backpack bombs so instead they're going to go to times square? megyn: forget mayor bloomberg. we are getting caught up in the hysteria. >> we handle big trials like this all the time. did the world come to a halt? megyn: but that the trial was a f...

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