Michael Avenatti, the attorney who rocketed to fame through his representation of porn star Stormy Daniels in her battles with President Trump, was charged Wednesday with ripping her off. Federal prosecutors in New York City said Avenatti used a doctored document to divert about $300,000 that Daniels was supposed to get from a book deal, then used the money for personal and business expenses. Prosecutors said only half of the money was paid back.

Daniels isn't named in the court filing, but the details of the case, including the date her book was released, make it clear that she is the client involved.

In a statement to CBS News, Avenatti maintained his innocence, saying "no monies relating to Ms. Daniels were ever misappropriated or mishandled." "She received millions of dollars worth of legal services and we spent huge sums in expenses. She directly paid only $100.00 for all that she received," the statement said.

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"I will be fully exonerated once the relevant emails, contracts, text messages, and documents are presented," the statement continued. "I was entitled to any monies retained relating to a book per my agreement with the client. It was part of my agreement for representation and compensation."

The charges pile on top of previous allegations of legal misconduct by Avenatti, who represented Daniels when she sued to be released from a nondisclosure agreement involving an alleged tryst with Mr. Trump.

Avenatti was previously charged in New York with trying to extort up to $25 million from Nike by threatening to expose claims that the shoemaker paid off high school basketball players to steer them to Nike-sponsored colleges. And in Los Angeles, he's facing a multicount federal indictment alleging that he stole millions of dollars from clients, didn't pay taxes, committed bank fraud and lied during bankruptcy proceedings.

Avenatti has denied the allegations against him on both coasts, saying he expects to be exonerated. The Los Angeles charges alone carry a potential penalty of more than 300 years in prison.

Daniels, whose real name is Stephanie Clifford, initially hired Avenatti to handle a lawsuit she filed last year in which she sought to invalidate the nondisclosure agreement she'd signed with Mr. Trump's then-lawyer Michael Cohen in exchange for $130,000.

In this file photo, attorney Michael Avenatti arrives at federal court on Monday, April 29, 2019. Jae C. Hong / AP

The money was supposed to buy her silence about an alleged affair with the president, who denies that it took place. In August, Cohen pleaded guilty to violating campaign finance laws in connection with the payment.

Daniels first publicly raised concerns about Avenatti's conduct in November. In a statement, she said Avenatti had launched a fundraising effort to raise money for her legal case without telling her. She also said he had filed a defamation lawsuit against Trump, on her behalf, against her wishes.

"For months I've asked Michael Avenatti to give me accounting information about the fund my supporters so generously donated to for my safety and legal defense. He has repeatedly ignored those requests," she said. "Days ago I demanded again, repeatedly, that he tell me how the money was being spent and how much was left. Instead of answering me, without my permission or even my knowledge Michael launched another crowdfunding campaign to raise money on my behalf. I learned about it on Twitter."

At the time, Avenatti responded that he was still Daniels "biggest champion."

He said that under his retention agreement, she had agreed to pay him just $100 for his services, and he was entitled to keep all the money he raised for her legal defense to defray what he said were substantial costs of her case. The defamation case initiated by Avenatti against Mr. Trump backfired, with a judge ordering her to pay the president's legal bills.

When Avenatti was first charged with defrauding other clients and extorting Nike in March, Daniels said she was "saddened but not shocked."

In a March interview, Avenatti denied wrongdoing but said he was "concerned" about the prospect of prison time.

"Of course I'm nervous," Avenatti told "CBS This Morning." "I am nervous. I'm concerned. I'm scared. I feel terrible for my family. I feel bad for my friends."