Andrew Mountbatten-Windsor is facing growing pressure from US officials and the family of his prominent accuser Virginia Giuffre to testify in the US about his links to paedophile financier Jeffrey Epstein.
Democrat Congressman Ro Khanna said the Royal Family had "not been transparent", while Congresswoman Teresa Leger Fernandez, also a Democrat, said "the King should direct his brother" to go to the US to answer questions.
Earlier on Tuesday, King Charles III had said the Royal Family were "ready to support" police in their inquiries.
Andrew has repeatedly denied any wrongdoing and reached an out-of-court settlement with Giuffre in 2022 containing no admission of liability.
In the King's first intervention in the latest round of revelations in the Epstein scandal, a Buckingham Palace spokesperson said if they were approached by the police, they stood "ready to support them" in their investigation.
