Lawyers hired by Brigitte and Emmanuel Macron hired top investigators to dig up dirt on podcaster Candace Owens before suing her for making allegations that France's First Lady is a man, it has been revealed.

The Macrons are suing Owens, a well-known rightwing political podcaster, after she made a series of 'outlandish, defamatory and far-fetched fictions', including that Brigitte was born a male.

As part of the legal process, the couple hired investigators from Nardello & Co., a top corporate intelligence firm, the FT reports.

In its report, Nardello & Co. described Owens' links to the far-right in France as well as her connections to right-wing populist figures in both the UK and US, along with her online interactions with a Russian nationalist.

They also reportedly outlined her shift from a self-identifying liberal in her early career to a conservative, as well as her support for Donald Trump that she recently dropped.