First Lady Melania Trump is threatening to sue Hunter Biden for more than $1 billion over his claim that she was introduced to her husband, Donald Trump, by convicted sex offender Jeffrey Epstein.

Her lawyers called the allegation “false, disparaging, defamatory and inflammatory,” demanding a public retraction and apology. The dispute stems from remarks Biden made in an interview earlier this month, in which he criticized Donald Trump’s past association with Epstein and claimed the financier had introduced the couple.

Donald Trump has acknowledged knowing Epstein but says their friendship ended in the early 2000s after Epstein allegedly tried to recruit staff from Trump’s Florida golf club.

In a legal letter to Biden’s attorney, Melania Trump’s team said the claim—based partly on reporting from journalist Michael Wolff—had caused “overwhelming financial and reputational harm.” Wolff’s comments were cited in a Daily Beast article that was later retracted after Melania’s attorney challenged its accuracy. The outlet apologized for “any confusion or misunderstanding.”

Her lawyers argue there is no evidence linking Epstein to the Trumps’ introduction, pointing instead to Melania’s own account in a 2016 Harper’s Bazaar profile that she met Donald Trump in 1998 at a party hosted by a modeling agency founder.

Biden’s allegation was made during an interview with filmmaker Andrew Callaghan, where he suggested unreleased Epstein documents could “implicate” Trump and repeated the claim about the couple’s meeting. Melania’s legal team accuses Biden of relying on a debunked and retracted source, describing it as “false and defamatory.”

Melania’s attorney, Alejandro Brito, said her lawyers are pursuing immediate retractions from those repeating the claim. A statement from her aide, Nick Clemens, reinforced that the first lady’s legal team is actively working to stop the spread of “malicious, defamatory falsehoods.”

The legal threat comes as pressure mounts for the release of so-called Epstein files—documents related to the late financier’s criminal investigation. President Trump has previously pledged to release the records if re-elected, but in July the FBI and Justice Department said no incriminating client list exists.