First lady Melania Trump has put former US President Joe Biden's son, Hunter Biden, "on notice," threatening to sue him for over USD 1 billion for claiming that Jeffrey Epstein introduced her to Donald Trump, Fox News reported.

Melania's attorney, Alejandro Brito, demanded that Hunter "immediately retract the false, defamatory, disparaging, and inflammatory statements" he made about the first lady in an interview earlier this month on the YouTube show "Channel 5 with Andrew Callaghan."

In the video, titled "Hunter Biden Returns," Biden claimed, "Jeffrey Epstein introduced Melania, and that's how Melania and the first lady and the President met," adding, "The connections are, like, so wide and deep."