A rift between Melania Trump and Hunter Biden has escalated with Hunter Biden's refusal to apologize for an allegation he made about the first lady and Jeffrey Epstein.

Hunter Biden claimed in an interview that sex offender Jeffrey Epstein introduced the first lady to her now-husband, Donald Trump, which the Trumps say is false.

Jeffrey Epstein did not introduce Donald and Melania Trump, the president said, after the first lady threatened to sue Hunter Biden for $1bn for making the claim.