Lawyers for state Sen. Charles Schwertner, a Georgetown Republican alleged to have sent lewd messages to a graduate student, said Wednesday that the University of Texas at Austin has hired former federal prosecutor Johnny Sutton to help investigate the accusation.

A UT-Austin spokesperson declined to comment, saying officials do not acknowledge or discuss ongoing investigations in order to protect the integrity of the process. Sutton could not be immediately reached.

In September, three unnamed UT officials told the Austin American-Statesman that the school had opened an investigation into the senator, whose district includes College Station and Huntsville, after he was accused of sending a graduate student a sexually explicit photo and text. Schwertner has repeatedly denied the allegations through a spokesperson and through his lawyers.

Schwertner is “devastated that the graduate student involved received any texts of this nature from anyone,” the lawyers, Perry Minton and David Minton, said Wednesday in a press release that also said the senator had taken a polygraph test and that the results backed his denial.

By hiring Sutton “to help resolve this matter, the University has engaged one of the most experienced and fair-minded investigators around,” the lawyers said. Sutton was recently contracted by UT to conduct an internal review, after a former employee of the law school was arrested amid a fraud investigation involving potentially millions of dollars.

The lawyers also said the university officials who spoke to reporters should be “identified, questioned and terminated” and that the “leak” was made “in order to damage Senator Schwertner in the middle of a political campaign. There is no other plausible explanation.”

This article originally appeared in The Texas Tribune at The Texas Tribune is a nonprofit, nonpartisan media organization that informs Texans — and engages with them — about public policy, politics, government and statewide issues.