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government targets. ukraine's president volodymyr zelenskyy urging extra caution on this holiday. >> [interpreter] we are sure to retaliate against any former russian tara. but please tomorrow be sure to follow security rules. please respect the curve. you act on the air right sirens. pay attention to official announcements, and remember, we altogether have to get to our victory. >> a lot more from ukraine in just a moment. ♪ ♪ ♪ but first, one of most powerful democrats in the u.s. congress will not be heading back to capitol hill next year. newly-drawn new york congressional ...

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...

team now filing a response to that fbi search for all of those boxes of classified material in his florida home two weeks ago. >> we'll start with the fbi seizure of classified documents at mar-a-lago. the former president wants a neutral third party called a special master to review the documents taken by the fbi and return anything not within the scope of the search warrant. we're also getting new information about how much sensitive data was at mar-a-lago and the concern at the national archives months ago, which set off this entire investigation. >> all right, so, let's get to cn...

>> zatko those represented by -- whistleblower, aid the same company that represented facebook whistleblower -- >> we are in touch with whistleblower agencies, we are taking it seriously. >> twitter is pushing back, saying that zatko is pushing a narrative of -- that is riddled with -- and lacks important context. when we spoke to zak cohen's lawyer, he said that the lawful whistleblower disclosure process only allow them to talk about these issues in general terms. for specific allegations about twitter, they referred us to zatko disclosure. i'm >> not going to go into details, but i will say...

Of some of the world's most famous people. >> he was one of the top five or six executives at the country. >> reporter: zatko is represented by the same attorneys that represented frances hogan. twitter is pushing back, saying zatko is pushing a narrative that is riddled with inconsistencies and inaccuracies and lacks important context. when we spoke to zatko and his lawyer, they said that the lawful whistle-blower disclosure process only allows them to talk about these issues in general terms. for specific allegations about twitter, they referred us to zatko's disclosure. >> i'm not going to ...