A woman who served on former Vice President Joe Biden's senate staff and who accused him of sexually assaulting her in 1993 has filed an official criminal complaint against the now presumptive Democratic presidential frontrunner.

Tara Reade filed the complaint about the alleged assault with the Washington Metropolitan Police Department in Washington, D.C.

She then tweeted on Friday that the statute of limitations on the allegation had passed, but that 'there is justice in just being heard in a dignified way.'

Reade has said that Biden shoved his hand under her skirt and penetrated her with his fingers while they stood in a senate corridor, an accusation he denied when she first made the claim last month.

Tara Reade, who served on former Vice President Joe Biden's senate staff and who accused him of sexually assaulting her in 1993, has filed an official criminal complaint against him

Reade, a day after filing the complaint, tweeted that the statute of limitations on the allegation had passed, but that 'there is justice in just being heard in a dignified way'

Reade has accused Biden of shoving his hand under her skirt and penetrating her with his fingers while they stood in a senate corridor, an accusation he has denied

The complaint was filed Thursday with the police department's sexual assault unit, Business Insider reports.

A department spokesperson was not immediately able to provide a copy of the police report when DailyMail.com reached out.

A spokesperson for the candidate also was not immediately available.

Biden's campaign came to his defense in late March when Reade first made the allegation on a podcast.

'Women have the right to tell their story, and reporters have an obligation to rigorously vet those claims,' Deputy Campaign Manager and Communications Director Kate Bedingfield said. 'We encourage them to do so, because these accusations are false.'

Reade was among the women who came out last year alleging he was too handsy.

She had said that in 1993, while she was in her mid-20s and Biden was still a senator from Delaware, touched her several times and made her feel uncomfortable.

Reade also said her duties were cut after she refused to serve drinks at an event. Biden, she claims, had wanted her serving because he liked her legs. The former staffer said she later felt pushed out and left in August 1993 after only nine months.

Reade, who had been supporting Biden's rival, Bernie Sanders, then expanded on her claim to journalist Katie Halper for her 'Katie Halper Show' podcast on March 25.

She also spoke with Hill.TV and Vox.

Just before filing the complaint, Reade tweeted that those who 'silence sexual assault & sexual harassment survivors' are complicit in the alleged abuse, without naming whom she was referring to.

'I was in my 20s I trusted my boss, Joe Biden,' she also wrote in the tweet.

'I want the generation behind me to feel the empowerment to lift their voice and stand in truth no matter how powerful the man or forces that enable him.'

Just before filing the complaint, Reade said in a tweet (pictured) that those who 'silence sexual assault & sexual harassment survivors' are complicit in the alleged abuse, without naming whom she was referring to

Reade posted an image on social media of what she looked like in 1993, the year she alleged Biden sexually assaulted her

An undated photo of Reade that she included in a social media post

Biden's campaign pushed back vehemently after the claims, providing a character witness to DailyMail.com and other outlets.

It included a statement from Marianne Baker, an executive assistant to Biden from 1982 to 2000.

'In all my years working for Senator Biden, I never once witnessed, or heard of, or received, any reports of inappropriate conduct, period - not from Ms. Reade, not from anyone,' Baker said in a statement, provided by the campaign.

'I have absolutely no knowledge or memory of Ms. Reade's accounting of events, which would have left a searing impression on me as a woman professional, and as a manager,' Baker continued.

'These clearly false allegations are in complete contradiction to both the inner workings of our Senate office and to the man I know and worked so closely with for almost two decades,' Baker added.

Reade told Halper that the assault occurred after she was told to deliver a gym bag to the then-senator. Reade said she tracked down Biden on Capitol Hill and he remembered her name.

Biden's campaign pushed back vehemently after Reade's claims, providing a character witness to DailyMail.com and other outlets. The presidential candidate is pictured with his wife Jill during a campaign stop in Philadelphia last month

'And then we were alone. And it was the strangest thing. There was no, like, exchange really, he just had me up against the wall,' she said.

She said she was wearing a work skirt, but no pantyhose.

'He just had me up against the wall and the wall was cold,' she said. 'His hands were on me and underneath my clothes. He went down my skirt and then up inside it and he penetrated me with his fingers. He was kissing me at the same time,' she said.

She said that when she 'pulled back,' Biden 'looked annoyed.'

Reade said Biden said to her, 'Come on man, I heard you liked me.'

'He implied that I had done this,' she told the podcast host.

At first Reade didn't want to mention the other quote that got stuck in her head, but then she told Halper what it was.

'You're nothing to me,' she claimed the senator said to her. 'Nothing.'