A first-term state representative and member of a House anti-sexual harassment task force has resigned after an ex-girlfriend claimed that he posted nude photos of her on a fake social media account under her name.

Rep. Nick Sauer of Lake Barrington tendered a letter of resignation yesterday afternoon to the House clerk’s office.

Politico reported that the ex-girlfriend filed complaints with Chicago police and the legislative inspector general.

House GOP leader Jim Durkin said the news was troubling and added “We should allow the proper authorities to conduct their investigation.”