In court documents, Evan Greebel, Martin Shkreli’s former lawyer, alleges that the notorious ex-pharmaceutical executive is a “serial fraudster” that duped him into alleged wrong-doing.

That argument counters Shrkeli’s, which is that if he did anything wrong it’s because Greebel gave him bum legal advice.

Shkreli was arrested in December of 2015 and charged by the FBI with several counts of securities fraud related to three interwoven, Ponzi-like schemes that defrauded investors and swindled $11 million from his former pharmaceutical company Retrophin, Inc. At the same time, Greebel was arrested and charged with wire fraud conspiracy in connection with the alleged schemes.

The two are both trying to have their cases separated so that they can blame each other.

In a court filing, Greebel’s lawyer, Reed Brodsky, of Gibson Dunn & Crutcher, will argue that Shkreli continuously lied and deceived Greebel to keep alleged schemes going. “Far from knowingly joining an alleged serial fraudster’s scheme, Mr. Greebel—a family man—was an unknowing latecomer who advised a fledgling public company in good faith,” Brodsky wrote.

Using this strategy will require Greebel to reveal information about his interactions with Shkreli that would otherwise be protected by attorney-client privilege, according to Brodsky.

But that might have happened anyway. Shkreli has made plain that he intends to blame Greebel for everything in court, and his lawyers have been collecting hundreds of thousands of documents from Greebel’s former law firm.

“What we have maintained from the beginning in court and in pleadings is that Shkreli was completely honest with Greebel and then relied on his advice,” Ben Brafman, Shkreli’s attorney, told Bloomberg Law. “For Greebel to maintain otherwise is simply belied by the thousands of email exchanges between Shkreli and Greebel, or Shkreli and other lawyers at Greebel’s firm who counseled him on almost everything that relates to this case.”

As a glimpse of what’s in those documents, Brafman revealed that Greebel charged Shkreli close to $10 million in legal fees. “Charging someone close to $10 million for legal advice that essentially gets you indicted is a lot of money to pay for that result,” said Brafman.