First lady Melania Trump has put former first son Hunter Biden on notice − but he’s not flinching.

On Aug. 6, the first lady threatened to sue the son of former President Joe Biden for more than $1 billion if he doesn’t retract the claim that she was introduced to her husband by convicted sex offender Jeffrey Epstein.

But that hasn’t stopped the scandal-ridden younger Biden, who was pardoned by his father after pleading guilty to tax violations and was convicted on firearms-related charges.

More: How Trump and 'terrific guy' Jeffrey Epstein's party boy friendship ended badly

On Aug. 14, Hunter Biden hit back with an expletive-laden response, saying he had read the account in newspaper articles dating back to 2019.