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>> i think there has to be two things. i think we have to take responsibility for what we sign up for and be careful and mindful. but i do think we have to level the playing field with some laws. you know, 100 years ago when photography was invented, it created new threats to privacy, and ultimately the law changed. interestingly, chris, right now the supreme court has taken some cases that have demonstrated they're now beginning to look at whether the law has to change again. >> the carpenter case with the police, about their needing a warrant to get your cell data. >> exactly, because what t...

Chertoff, the author of "exploding data." you're worried about cyber security? read the book. welcome to "prime time," secretary. >> pleasure. >> lseparating kids. you were one of the architects of operation streamline. you had a problem with illegal entrance then during the george w. bush administration. you had to figure out how to deal with it. you looked at the problems of families and kids, and you made a decision. what was it? >> well, we actually kept them together. we actually created facilities that would allow us to keep the families together while they were being processed and ultim...

And ultimately the law changed. interestingly, chris, right now the supreme court has taken some cases that have demonstrated they're now beginning to look at whether the law has to change again. >> the carpenter case with the police, about their needing a warrant to get your cell data. >> exactly, because what the court's now saying is, you know, it's not just about keeping your data hidden. it's about who controls the data after it's been collected. i think that's an important step forward. >> with opportunity comes responsibility. the book is "exploding data, reclaiming our cybersecurity in...

President saying why would an american president whose first nato meeting last year was a disaster show up in belgium this year just to prove he does not understand how vital alliances have made a huge difference for the security of the united states and the lives of europeans? i think he might remember that it was nato that stood shoulder to shoulder with the united states after 9/11 among many other contributions, a point you were just making. >> exactly. and again, now with russia actually on the rise and being more aggressive, nato has become more relevant than it's been for a couple of de...

Department in it haste. but now they've really got to step up the process of making sure we don't have any lost children. that would be really, as i say, an assault on motherhood, which is something we generally consider to be off limits. >> michael chertoff. the book is "exploding data." thank you so much for being with us on all fronts. perfect segue, joining me from el paso, texas, nbc's gabe gutierrez with the story of two fathers who have been reunited with their kids after being separated at the border. finally, a good story, a small one. >> reporter: hi, andrea, good afternoon. this n...