Porn star files lawsuit against President Trump

The lawyer for Stormy Daniels told ABC News that Trump must've known about the deal negotiated before the 2016 election to pay the actress to keep quiet about their alleged affair.
6:53 | 03/08/18

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Transcript for Porn star files lawsuit against President Trump
a lawsuit. She's the porn star whose name keeps popping up in the white house briefing room. Stormy Daniels. Stormy Daniels. Because stormy Daniels claims to be intimately familiar with the president of the united States. What the president has addressed these directly and made very well clear that none of these allegations are true. This week Daniel's attorney file aid lawsuit on her behalf in L.A. Superior court alleging the agreement she sined in 2016 is now null and void because trump never signed it. There's a signature line for Mr. Trump and he never signed it. The president's personal lawyer Michael Cohn admits to paying Daniels $130,000 of his own money days before the election but told ABC news noorj the trump organization nor the trump campaign was a party to the transaction. We believe that he absolutely knew about it but purposely did not sign it so that later could have denyability as to its existence and to the payment to miss Davenport yells. Miss Daniels. Now despite that payment and the agreement, Daniels is threatening to tell her story. Please welcome stormy Daniels. Until now she stopped short of that dropping tantalizing hints to Jimmy Kimmel. Do you have a non-disclosure agreement. Do I? You can't say, but if you didn't have a non-disclosure agreement you could say it. You're so smart Jimmy. But so far court documents this week claim miss Clifford began an intimate relationship with Mr. Trump in the summer of 2006 in lake tahoe and continued that relationship well into the year 2007 putting the start of the relationship 1some time after the president married first lady Melania trump, four months after good their son was born. Her real name Stephanie Clifford who crossed over into main stream movies in 2005 with a cameo with the "40-year-old virg virgin". And in 2007 she was well aware of the stigma attached to her chosen profession as she told "Nightline." It's one of those businesses when you commit to do it there's no going back because of that stigma. The world. I would never be president. I would make an excellent president by the way but would never be president because of what I had done. There's a rich tradition of scandals in the oval Oscar. Kennedy with Monroe. ??? Happen Yi birthday, Mr Mr. President ??? Most notably Bill Clinton. I did not have sexual relations with that woman. Of course he wasn't telling the truth. Depends on what the meaning of the word is. That led to his impeachment. All of that providing ample precedent of the news worthiness of the Daniels allegationss. I think it matters because we're seeing with this administration over a-year a consistent pattern of denying realbelling everything dpak news. Oddly this a private affair cannot be labelled fake news and continues to dog at this white house. It's not just about the morality there's also the money. For one thing that $130,000 payment from trump's personal lawyer to Daniels. That's illegal. IFS if the money came from Mr. Cohn that's illegal. The watch dog common cause filed complaints with the federal elections commission and department of justice alleging violation of campaign finance laws. This is a serious issue because Americans have a right to know who is spending money to influence their elections and here we have a major party nominee running for president who ended up becoming president seemgingly intentionally hiding important information about money he was spending to affect the election that's a big deal. Experts say this is unlikely to derail trump in the way lewinksi derailed Clinton investigation. Robert Mueller is investigating a lot of issues. There's concerns but I don't think stormy Daniels case will be near the top of the to-do list. In an era of me too at a time women are drawing record crowds to March against the president and his policies the issue is not likely to endear him to women voters. I would home that stormy Daniels courage in filing this lawsuit and getting her story out would inspire any other women who may be out there who have allegations against Donald Trump to contact an attorney and find out what their rights are and perhaps ultimately speak out. Today the white house insisted the president has been cleared. As I outlined earlier this case had been won in arbitration and that there was no knowledge of any payments from the president and he's denied all of these allegations. Late tonight an attorney for the president's attorney Michael Cohn suggested the lawsuit filed this week violates confidentiality agreement. Adding this -- also Michael Cohn on trained a temporary retraining order to prevent Daniels from talking about the alleged affair. Ten years ago she couldn't have predicted this. Where do I see myself in ten years, doing this right now, I'm pretty sure I will not be taking my pants off I will be watching other people doing it. Little did she know then she'd be a headline the white house can't simply ignore. For "Nightline" in New York.

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

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