WASHINGTON — A singer and potential congressional candidate said Tuesday that she has filed a sexual assault complaint against President Donald Trump's former campaign manager for hitting her twice on her buttocks during a Washington gathering in November.

Joy Villa, a Trump backer who wore a "Make America Great Again" dress at the Grammys this year, said she plans to meet with detectives in Washington next week about the complaint against Corey Lewandowski.

Here’s the photo of @CLewandowski_ seconds before he slapped my ass, I told him to stop, and then he did it again. I was shocked and embarrassed by his behavior. https://t.co/61EYvOG4e9 pic.twitter.com/a8NgLnvCEZ — Joy Villa (@Joy_Villa) December 23, 2017

In a phone interview from Tampa, Florida, Villa said she was initially reluctant to come forward because she was worried about any backlash. But she said she called Washington's Metropolitan Police Department on Christmas Eve after a friend who witnessed the incident spoke about it publicly, and other friends urged her to come forward.

"I didn't know him at all," Villa said about Lewandowski. "I only knew him by reputation. He broke my trust."

Related: Here’s a growing list of men accused of sexual misconduct

She said she saw him at a gathering at the Trump International Hotel on the day after Thanksgiving, and said Lewandowski struck her "extremely hard" even after she told him to stop. She said she felt it was "disgusting and shocking and demeaning."

Joy Villa arrives at the 59th Annual Grammy Awards February 12, 2017 in Los Angeles. Mario Anzuoni / Reuters file

Villa, who is considering a run for a Florida congressional seat, said she initially thought it was sexual harassment, but police told her that touching someone on any body part that is sexual in nature constituted sexual assault. She said she was told it was classified as a misdemeanor.

"I was initially fearful to come forward with this," she said, adding that she did not want to bring shame or embarrassment on Lewandowski's family or hers.

Related: A timeline of Corey Lewandowski’s tenure with Trump campaign

"I did nothing wrong," Villa said. "I realized if he's not going to respond or apologize to me, I think it's the right thing to do."

Lewandowski did not respond to requests for comment.

Villa made news earlier this year when she wore a dress displaying Trump's campaign slogan at the Grammys. She explained her decision to wear the dress in an Instagram post, writing, "You can either stand for what you believe in or fall for what you don't." She added, "agree to disagree."

This is not the first time Lewandowski has faced police charges. In March 2016 he was charged with misdemeanor battery for an altercation involving a female reporter after a news conference in Florida.

The charges were later dropped in April but Trump fired him as campaign manager in June 2016.