Thousands of dollars have been raised as part of a campaign to bring a private prosecution against Andrew Mountbatten Windsor, formerly Prince Andrew.
In its online campaign, Republic, an anti-monarchy group, aims to raise £50,000.
The organisation, which has so far raised almost £20,000, said a private prosecution could cost anywhere from £15,000 to £150,000 or more.
Republic has taken the unprecedented step of instructing a law firm to launch a private prosecution.
It said lawyers will be actively investigating the case against Andrew with a view to launching a trial in the coming weeks.
The group said: “The Republic has instructed lawyers to pursue a private prosecution of Andrew Mountbatten Windsor (formerly known as Prince Andrew) over allegations of sexual misconduct and misconduct in public office.”
“We’ve called on the police to investigate Andrew. We’ve called on the government to call a Royal Epstein inquiry. “But none of them have acted. So if they don’t want to take action, we will,” Republic said.
The group also published on its website Virginia Giuffre’s quote from her posthumous book “Nobody’s Girl”: Prince Andrew thought having sex with me was his birthright.”
The group said in its statement: “Nothing has really changed for Andrew, who, according to visitors to the Royal Lodge, spends much of his time playing video games. He is still technically a Duke, only an act of Parliament would strip him of that title. He is still technically an HRH, a Knight of the Garter, the highest order of British chivalry, and he is still the Earl.”
The campaign was launched after King Charles III stripped his younger brother, Andrew, of his remaining royal titles on October 30 over his links to the late sex offender Jeffery Epstein.
As part of her crackdown on the former Duke of York, the monarch also asked him to leave his royal residence.
