Ex-national security advisor takes aim at Trump administration

John Bolton spoke in public for the first time and said the White House tried to “censor” him by holding up the publication of his book.
2:40 | 02/18/20

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Transcript for Ex-national security advisor takes aim at Trump administration
We'll get the latest from John Bolton. The president's former national security adviser is speaking in public for the first time taking on the trump administration for trying to censure him by holding up the publication of his book and teasing more critical information about president trump. Cecilia Vega is in Washington with the details. Good morning, Cecilia. Reporter: Good morning to John Bolton is believed to have firsthand information about the president's now infamous phone call with Ukraine. Democrats very much wanted to hear from him during the impeachment trial but he refused to voluntarily show up instead teasing what he knows saying it's all in his new book. Speaking publicly for the first time since the impeachment trial, overnight president trump's former fat security adviser bashed his old boss accusing the white house of censuring his upcoming book. I say things in the manuscript about what he said to me. I hope they become public someday. He tweets, but I can't talk about it. How fair is that? Reporter: Bolton appearing on stage at duke university. Journalists only permitted to record the start of the event but ABC news has obtained audio of his full remarks. Bolton repeatedly teasing his book saying president trump was tied to the pressure campaign on Ukraine. It's undergoing a security review after the administration says it contains classified information. There are portions of the manuscript that deal with Ukraine. I view that like the sprinkles on the ice cream sundae, meaning in terms of what's in the book, this is an effort to write history and I did it the best I can. We'll have to see what comes out of the cent scoreship. Reporter: Bolton refused to testify before congress and overnight he dodged ukraine-related questions instead teasing his book. Do you agree with the president that the zelensky call was perfect? What's that? Do you agree with the president that the zelensky call was perfect? You'll love chapter 14. Reporter: Bolton did lash out on a long list of other issues criticizing the president's handling of foreign adversaries like North Korea. I think it's also been a failure, I think, the pursuit of Kim Jong-un and the meetings with him and the efforts to get a deal with north are doomed to failure so I think this has Brann a wasted two years. Reporter: President trump has called this upcoming book nasty and untrue. Guy, it's also worth noting at times that duke university audience applauded at the suggestion that perhaps Bolton should have testified or at least held a news conference instead of holding on to this information for an upcoming book. He may be getting a company from the house as well. Okay, Cecilia, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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