Illinois state Rep. Nick Sauer (R) will resign on Wednesday after Politico reported an ex-girlfriend had accused the lawmaker of publishing nude photos of her on a fake Instagram account

Sauer's resignation was announced by Illinois State House Republican Leader Jim Durkin in a statement, according to the Chicago Daily Herald.

"The allegations that have come forth against Representative Nick Sauer are troubling," Durkin said in a statement, according to the publication. "He will be resigning from office [Wednesday]. We should allow the proper authorities to conduct their investigations."

Sauer's office did not immediately reply to a request for comment from The Hill.

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Politico reported on Wednesday that Sauer's former girlfriend, Kate Kelly, had filed an official complaint against the lawmaker with Illinois's Office of the Legislative Inspector General.

In her complaint, Kelly alleged that Sauer used an Instagram account “to catfish other men using my privately shared naked photos. Nick would use this account to direct message men with my photos to engage in graphic conversations of a sexual nature," according to Politico.

"The men believed they were communicating with me and Nick shared private details of my life,” she also said in the complaint.

Kelly added in the complaint that she had filed a police report with the Chicago Police Department and that there is an investigation into her allegations, according to Politico.

The report prompted outrage from Illinois state lawmakers.

State Sen. Melinda Bush (D) called on Sauer to resign in a statement to The Hill.

"This is exactly why I fought for the creation of the Joint Task Force on Sexual Discrimination and Harassment Awareness and Prevention, so we could give victims a safe space to come forward and so we can take the necessary steps to change the culture in Springfield and eliminate sexual harassment," Bush said.

State Sen. Dan McConchie (R) told The Chicago Tribune that Sauer "made the right decision to resign his seat in the Illinois House of Representatives."

Sauer, who represents the state's 51st District, was running for reelection for a second term before the report surfaced on Wednesday. He was also a member of the House Sexual Discrimination and Harassment task force, the Tribune reported.