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Hearing to discuss his allegations of serious security vulnerabilities at the social media company twitter. after cnn and "the washington post" exclusively obtained this explosive whistle-blower report from the former head of security. donie o'sullivan broke this story. he's here with the latest this morning. you know, clearly this caught the attention of congress. we speculated it would almost immediately had you broke this on cnn the other day. what is the expectation for his testimony? >> yeah, so a lot has happened in the 48 hours since this story broke here on "new day." he is going to ap...

22 minutes past. they are welcome back. twitter is facing accusations of security vulnerabilities, executive cover-ups, and potential foreign spies working as employees. the allegations come from someone who should know, twitter's former security cheese. peter zatko is expected to take place in capitol hill hearings this week, but before he speaks to, lawmakers spoke exclusively to cnn's joni o'sullivan. >> why are you coming forward? >> all my life, i've been about finding places i can go and make a difference. >> this is peter zatko. until january this year, he was

That has nothing to do with his decisions, or with the content of what was sent into u.s. law enforcement agencies. >> much has not been talking to musky or anything in the background? >> no, not at all. >> zatko says he was fired by twitter in january of the year after he tried to raise the alarms internally. he points the finger at twitter ceo, who has worked to hide twitters security vulnerabilities from the board. >> i suspect that twitter might try to paint it like this. mudge got fired, and he's trying to retaliate against the company. >> absolutely, not this is not any kind of personal ...

I had no life for the six months. it's not a life, it's not a life. [end of translation] >> many aid groups, humanitarian groups are on the ground, helping ukrainians suffering from this war. find out how you can help, please visit cnn.com slash impact. just ahead here on cnn, a whistle blower going public with explosive allegations against twitter. he speaks exclusively to cnn, with security vulnerabilities he says the tech companies hiding. that is next. lysol is donating 28 million wipes to schools in need, so they can kill 99.9% of viruses and bacteria. keeping kids together here, at place...

Fired by twitter in january of this year after he tried to raise the alarm internally. he points the finger at twitter's ceo saying has worked to hide twitter security vulnerabilities from the board. >> i suspect twitter might try to paint it like this, that mudge got fired and he's trying to retaliate against the company. >> absolutely not. this is not any kind of personal issue for him. he was eventually fired in january of this year. but he hasn't given up on trying to do that job. >> reporter: in response to the allegations, twitter told cnn security and privacy had long been a priority at...