Michael Avenatti, the lawyer who rocketed to fame through his representation of porn star Stormy Daniels in her battles with US President Donald Trump, has been charged with ripping her off.Federal prosecutors in New York City alleged Avenatti used a doctored document to divert about $US300,000 ($A436,087) Daniels was supposed to get from a book deal, then used the money for personal and business expenses.Only half of that money was paid back, prosecutors said.Daniels isn’t named in the court filing but the details of the case, including the date her book was released, made it clear she was the client involved.Avenatti denied the allegations on Twitter and later added his agreement for representing Daniels “included a percentage of any book proceeds.”The charges pile on top of previous allegations of legal misconduct by Avenatti, who represented Daniels when she sued to be released from a non-disclosure agreement involving an alleged tryst with Trump.Avenatti was previously charged in New York with trying to extort up to $US25 million ($A36 million) from Nike by threatening to expose claims that the shoemaker paid off high school basketball players to steer them to Nike-sponsored colleges. In Los Angeles, he’s facing a multi-count federal indictment alleging…