President Donald Trump baffled the internet on Saturday evening after posting an image of an unidentified woman accompanied by the caption, "Great daughter.

"Great daughter. My Honor! ! ! President DJT," he wrote beneath a dated photograph of a middle-aged or older blonde woman, dressed in a professional all-black outfit with fashionable boots. Gold bracelets adorn her right hand.

The woman beams towards the camera, captured mid-telephone conversation. She holds an older-style phone to her ear while turning her head.

The red sofa on which she sits forms part of a living room containing a rocking chair, several tables and artificial plants.

Her other hand clutches a mug with steam rising from a hot beverage. Trump provided no explanation about the woman's identity in the photograph, nor clarification of his "great daughter" caption.

The woman pictured is clearly not Trump's daughters, Ivanka or Tiffany, nor his former wife, Marla Maples. Sharing a screenshot of the perplexing Truth Social post, journalist Aaron Rupar asked, "Who is this?"

Another X user raised the identical question, remarking, "Wait, who the hell IS this woman though? Because this photo looks like it's from the 1990s."

Online sleuths believe the woman is Margo Catsimatidis, wife of John Catsimatidis, a New York billionaire and Trump associate. "I think that is Margo Catsimatidis. Wife of John. Also a New York billionaire," one user commented, alongside a photograph of the pair.

"Is he saying she has a great daughter? Why would he say that?" another user remarked beneath the image of the Catsimatidises.

A further commenter stated they believed that was indeed what Trump was referring to, sharing a screenshot of a tweet from Andrea Catsimatidis, who has served as chair of the Manhattan GOP since 2017.

"I think so. The daughter was/is chair of the Manhattan GOP," that user wrote. Andrea's screenshotted tweet from May 2019 features a picture of her with Donald Trump Jr. and his then-girlfriend, Kimberly Guilfoyle.

"Thank you @DonaldJTrumpJr and @kimguilfoyle for coming out last night to support the @Manhattan_GOP," she captioned the picture.

Whether Trump was genuinely referring to Andrea Catsimatidis in the Truth Social post remains unclear, as does the true identity of the woman pictured.

The comments section beneath the Truth Social post was equally flooded with users querying the woman's identity, with no definitive conclusions coming to light.