An attorney charged with witness tampering for allegedly urging some clients to lie is fighting back, saying prosecutors have a vendetta and are "corrupt" for pursuing the case.

Meantime, the Utah State Bar confirmed that it ordered Geoffrey Clark to return $8,400 of $10,000 he charged the family of child-killer Alejandro Miranda for his representation. The family felt cheated because the case was plea-bargained and Miranda still got a 30-years-to-life sentence.Miranda is one of three high-profile clients Clark is accused of having urged to lie in their defense. He's been charged with nine felony counts of witness tampering.

The other clients include serial rapist Jason Brett Higgins and arsonist Trev Poulson. All three criminals are prepared to testify against Clark, according to court documents, as are two interpreters involved in the Miranda case.

Clark dismisses their claims as sour grapes from untrustworthy convicted criminals. And he says he has witnesses that exonerate him.

"You're talking about people with the credibility of a serial rapist, an arsonist, and a man who killed his own daughter," Clark said. "All of whom have lost their cases, all of whom have been convicted. That's the foundation of the case against me.

"They are prosecuting me without a shred of evidence," he said.

Clark has retained lawyer John Hutchison to fight the witness tampering charges. No arraignment has been set.

"I am looking forward to the trial," he said. "It will offer a forum to exonerate me."

Hutchison is also representing Clark at his trial Tuesday on an assault charge stemming from an allegation by Higgins that Clark slugged him in the chest while he was handcuffed.

Clark said prosecutors are persecuting him because he's willing to take his cases public.

"I'm the only defense attorney here who holds press conferences," he said. "There are times when the media may be the only forum where the defense has the chance to set the record straight."

Clark confirmed the bar association ordered him to return the money to Miranda's family, but said it had nothing to do with the tampering allegations.