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security peiter zatko, alleging the social media giant's leadership misled its own board, and government regulators about security vulnerabilities that could potentially open the door for foreign spying, hacking and disinformation campaigns. those are stunning, serious claims sent to congress and several federal agencies last month. our very own cnn correspondent donie o'sullivan sat down with him to talk about this. here's the story. >> reporter: ready? >> yes. >> reporter: why are you coming forward? >> all my life i've been about finding places where i can go, and make a differenc...

He felt like he had to say that. it's fun for him but it does make things a lot more difficul difficult. >> brian: the best closures in baseball have short-term memory. you can be the best picture and then blow it all. like mariano rivera did. i've never seen a guy get up and turn the page as as president trump. this guy does not worry about yesterday. he's already off the next day. >> nan: but he knows. speech last night, the tenor he took. the words he said, there was a somewhat subtle difference but it was a material difference in the way he acknowledge certain things. he is demonstrating h...