The Duke of York should apologize for his friendship with Jeffrey Epstein, says a lawyer for the convicted sex offender.
Spencer Kuvin, who represents several named alleged victims, said "royalty has failed with them".
He called Prince Andrews interview with BBC Newsnight on Saturday "sad" and "depressing".
The Prince has stood by his decision to participate, although critics describe it as a "car crash".
In the middle of the backlash, Prince Andrew is now facing renewed talks to tell the US authorities about his friendship with Epstein – who at the age of 66 took his own life awaiting trial on sex trafficking charges in the United States.
On Monday, Kuvin told the Today program: "It was depressing that he [Prince Andrew] did not really acknowledge the breadth of his friendship with this despicable man and apologize.
"The fact that he was a friend of a convicted sex offender and chose to continue his relationship with him – it just shows a lack of recognition of the breadth of what this man [Epstein] did to these girls. "
Prince Andrew told the BBC that he never suspected Epstein's criminal behavior while visiting the US financier's three homes.
But Mr Kuvin said he "didn't think there was any way" the prince could have avoided seeing what happened, "with young girls being sent in and out of these homes.
Kuvin said that Epstein's prosecutor's focus had now turned to potential associates.
This has led to questions being asked about the role Epstein's former girlfriend, Ghislaine Maxwell, may have played in bringing underage girls to the financier.
Maxwell denies all inaccuracies.
Attorney Lisa Bloom – who represents five other prosecutors from Epstein – agreed to the interview that Prince Andrew should be interviewed by US authorities following his BBC interview.
She told the BBC's Victoria Derbyshire program: "I think he made it worse for himself in this interview and I think it is more likely that the authorities will want to talk to him now – and they should. "
Gloria Allred – another lawyer, who also represents one of Epstein's prosecutors – told ITV's Good Morning Britain: "Now he's been in public court, he should testify before the FBI."
- Six things we learned from the Prince Andrew interview
- Who was Jeffrey Epstein?
At the same time, Labour's shadow trade secretary, Barry Gardiner, said Prince Andrew should do what he can to help Epstein's victims.
He said: "By saying what he knows about the time he spent with his former friend, it can only be the right thing to do."
In the Newsnight interview, Prince Andrew said he will testify under oath "if push came to fire" and his lawyers advised him to.
It comes when the Prince continues to face harsh criticism for the interview, as many commentators noticed a public relations disaster.
In the prince Andrew "categorically" denied having any sexual contact with Virginia Giuffre, known at the time Virginia Roberts.
The first occasion, she said, took place when she was 17 years old.
People close to Prince Andrew said he wanted to address the issues and did so with "honesty and humility" when speaking to BBC Newsnight.
In a lengthy interview, which UK viewers can watch in full on BBC iPlayer or YouTube elsewhere in the world, the prince said:
- On that date Virginia Giuffre says he had sex with her – on March 10, 2001, he had taken his daughter to Pizza Express in Woking for a party before spending the night at home
- He dismissed claims that he was sweating a lot because he had a "special medical condition," meaning he can't sweat, caused by an adrenaline overdose in the Falklands War
- He had ordered investigations into whether a photograph of him with Giuffre had been forged, but they were unequivocal
- Talking about his relationship with the financier had become almost "a mental health problem" for him
- He would testify under oath about his relationship with Giuffre about "push came to shoot," and his lawyers advised him to
- He was unaware of an arrest warrant against Epstein when he invited the financier to Princess Beatrice's 18th birthday party at Windsor Castle
- He did not regret his friendship with Epstein because of "the opportunities I got to learn" from him about trade and business