Emmanuel Macron and his wife, Brigitte, are planning to present photographic and scientific evidence to a US court to prove Mrs. Macron is a woman.
Their lawyer says the French president and Mrs. Macron will present the documentation in a defamation suit they have taken against the right-wing influencer Candace Owens after she promoted her belief that Brigitte Macron was born male.
Ms. Owens' lawyers have responded with a motion to dismiss the claim.
Speaking to the BBC's Fame Under Fire podcast, the Macrons' lawyer in the case, Tom Clare, said Mrs. Macron had found the claims incredibly upsetting and they were a distraction to the French president.
I don't want to suggest that it somehow has thrown him off his game. But just like anybody who is juggling a career and a family life as well, when your family is under attack, it wears on you. And he's not immune from that because he's the president of a country, he said.
Mr. Clare stated that there would be expert testimony that will come out that will be scientific in nature and while he would not reveal, at this stage, its exact nature, he said the couple were prepared to demonstrate fully both generically and specifically that the allegations are false.
When asked if the Macrons would be supplying pictures of Brigitte pregnant and raising her children, Mr. Clare said they existed and would be presented in court where there are rules and standards.
In July, the Macrons filed a lawsuit against Ms. Owens in the US. It alleges she disregarded all credible evidence disproving her claim in favour of platforming known conspiracy theorists and proven defamers.
In American defamation cases against public figures, plaintiffs are required to prove actual malice - that the defendant knowingly spread false information or acted with reckless disregard for the truth.
Ms. Owens, a former commentator for conservative US outlet Daily Wire who has millions of followers on social media, has repeatedly promoted her view that Brigitte Macron is a man.
In August, Emmanuel Macron explained the motivation for their legal action, stating: This is about defending my honour! Because this is nonsense. This is someone who knew full well that she had false information and did so with the aim of causing harm, in the service of an ideology and with established connections to far-right leaders.
