A woman claimed that she was raped by GOP frontrunner Donald Trump when she was a teenager at a sex party. Trump has vehemently denied the claims, saying that they are categorically false.

She lodged a complaint against Trump and billionaire financier Jeffrey Epstein at the Central District Court of California on Tuesday. The woman who identified herself as Katie Johnson in the court papers sued the duo for US$10 million (AU$13.07 million).

She alleged that the Republican presidential hopeful and the financier treated her like a “sex slave” during a period of four months in 1994. She added that Trump along with Epstein, the billionaire paedophile, sexually abused her when she was 13 years old “under the threat of harm” and “conspiracy to deprive civil rights,” the Mirror.co.uk reported.

In the claim, Johnson alleged that “she was enticed by promises of money and modelling career to attend a series of underage sex parties held at the New York City residence of defendant Jeffrey E. Epstein and attended by Donald J. Trump.” The Mail Online reported that the woman has been offering her alleged story to a number of news agencies and selling her photographs for US$20,000 (AU$26,150).

Trump, 69, denied the allegations saying it was a part of a political campaign against him to deter him from winning the party nominations.

“The allegations are not only categorically false, but disgusting at the highest level and clearly framed to solicit media attention or, perhaps, are simply politically motivated,” he told the Mail Online. “There is absolutely no merit to these allegations. Period.”

Johnson claims that she, along with another sex slave, gave Trump and Epstein naked, sexually charged massages in the same room at a sex party, which was organised by Epstein.

The lawsuit also stated that a New York-based party planner, who worked for Epstein for 10 years, is willing to give testimony to Johnson’s claims.