say it. >> that's something going on in brussels, and we're pretaping this. what do you think is happening? do you anticipate another attack in brussels or somewhere else? >> the warnings that have been issued by belgian authorities, by the u.s. embassy in brussels to u.s. citizens have been remarkably specific about the nature of the threat. it's hard to say at this point, but it wouldn't put it past isis that they would try a series of attacks. maybe this is misdirection. maybe they want to show they can intimidate the capital of the european union. but i would take the threat seriously. >> gabrielle, the thesis of youw book is we have to look out for these non-state actors. you don't need a huge nation to destroy you. it could be one guy, a drone and anthrax. doesn't that lend itself to a more prudent process?