A forensic examiner in St. Louis is extracting data from the cellphone of Missouri Gov. Eric Greitens, days before the governor goes to trial on a felony invasion of privacy charge.

The St. Louis Post-Dispatch reports that the examiner was working Tuesday in a locked courtroom with yellow paper taped over the windows.

An investigator for the St. Louis circuit attorney's office had cited what he believed was suspicious activity in a Gmail account after an investigation of Greitens was announced earlier this year.

Defense lawyers on Monday filed a motion to quash a sealed search warrant and stop any forensic exam of the phone.

Greitens is accused of taking an unauthorized photo of a woman who was at least partially nude. He's admitted having an extramarital affair with her in 2015.