State Sen. Carlos Uresti is accused of having a sexual relationship with a key witness against him in an upcoming criminal fraud trial.

The accusation comes a little more than a week after explicit text messages between the witness and Uresti’s codefendant, Stan Bates, were included as part of a court motion.

According to the prosecutors’ star witness, Denise Cantu, her relationship with Uresti began in 2010 when she was a client of his. She said it started with text messages and then later turned into a physical relationship.

Prosecutors said Uresti used his relationship with Cantu to convince her to invest in a fracking sand company that later went bankrupt.

Uresti’s attorney said even if Uresti had sex with Cantu, it wasn’t necessarily a violation of state discipline rules.

Uresti has denied having a sexual relationship with Cantu.

The federal trial is set to begin Jan. 4.

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