A Minnesota Senate staff member filed a complaint Tuesday alleging that Democratic state Sen. Dan Schoen sent her an uninvited, sexually explicit photo in 2015.

Ellen Anderson filed her complaint with the Senate’s human resources department. Anderson told Minnesota Public Radio that Schoen used Snapchat, a mobile messaging app, to send her a message that included a photo of a man’s genitals.

Schoen, of St. Paul Park, was a House legislator then but was elected to the Minnesota Senate in 2016.

Schoen’s attorney, Paul Rogosheske, denied that his client sent that kind of message to Anderson or any other woman. Rogosheske said he and Schoen will “address the complaint as it comes.”

Anderson, who coordinates digital communications for Senate Democrats, said receiving the photo didn’t make her feel unsafe at the time.

“Now it’s becoming clear that it sounds like that’s a pattern,” said Anderson, who is not the former St. Paul DFL senator of the same name.

“One mistake is one thing,” Anderson said. “A history of doing something like this is something very different.”

Schoen is accused of having made unwanted advances toward women and groping a woman from behind. Last week, he told the online news outlet MinnPost that the allegations were taken out of context or, in some cases, are false.

Despite pressure from Gov. Mark Dayton and other Democratic leaders, Schoen said he doesn’t intend to resign.

A friend of Anderson said she was present when the message came through. Lyssa Leitner said she was peeking at the messages on Anderson’s phone. She said she asked Anderson who she was communicating with and Schoen was the answer.

“I said, ‘Were you expecting that? Had that happened before?’ She said, ‘Nope, that was unexpected.’ ” Leitner told MPR. “Clearly I do remember her yelping in an ‘oh my gosh’ type moment.”

Schoen, a Cottage Grove police officer, has been placed on desk duty by the department’s chief.

Sexual harassment accusations were also leveled at a second legislator last week.

Rep. Tony Cornish, a Republican from Vernon Center, is accused of conduct that includes unwanted advances toward a lobbyist.

Cornish, who is single, has denied the most lewd conduct ever happened, but he acknowledged sending text messages, saying he was interested in a relationship with the lobbyist. He was also accused of sending an inappropriate text to Rep. Erin Maye Quade, a Democrat from Apple Valley; Cornish has said it was a misinterpreted attempt at humor.

Quade has also accused Schoen of harassing behavior directed toward her.

Republican House Speaker Kurt Daudt has suspended Cornish’s chairmanship of the House Public Safety Committee, and former House Speaker Kurt Zellers, a Republican, has called on Cornish to resign. Daudt has also said that an outside firm will be hired to independently investigate the allegations against Cornish, at the recommendation of the House’s nonpartisan human resources staff.

Cornish is a retired police officer who has served in the Legislature since 2002.

The allegations against the two lawmakers come amid a tide of sexual harassment and assault allegations against powerful figures in politics, media and entertainment, including movie producer Harvey Weinstein.