President Donald Trump sparked confusion with a strange Father's Day post where he seemed to praise a mystery woman whom he called a 'great daughter.'

On Saturday, Trump uploaded a photo of a blonde woman dressed in all black just before 10pm.

'Great daughter,' wrote the president, before signing the post off with: 'My Honor!!! President DJT.’

The president has five children with three different mothers. Trump had Eric, 42, Ivanka, 44, and Donald Jr., 48, with Ivana Trump.

Trump, 80, also had Tiffany, 32, with Marla Maples and his youngest child, Barron, 20, with First Lady Melania.

Internet sleuths have identified the woman as Margo Catsimatidis, the wife of billionaire and Trump ally John Catsimatidis, however, the identity of the woman has not been officially confirmed. 

The Daily Mail has reached out to the Catsimatidis for comment. 

Many online speculated that the picture was shot at Camp David, likely during the Clinton administration.

Most of the reaction shared by users online was nothing but confusion, as many offered their own theories as to why the president would post such a photo with such a puzzling caption. 

'No, seriously. Who is that?' one person asked on X. 

'Wait, who the hell IS this woman though?' asked another. 'Because this photo looks like it's from the 1990s.'

'It’s Margo Catsimatidis. No idea why he’s mentioning it’s his honor and daughter,' a third noted.  

Several others suggested that the post is evidence of Trump's alleged mental and physical decline.

One user wrote to X: 'This HAS to be dementia.'

Another added: 'Another evidence of mental decline. The president is suffering from dementia. Somehow, MAGA will spin this.'

A third said: 'My mother has dementia. She was doing stuff that made no sense, like this is the beginning. We took her phone away.'

The White House, the president's physician and Trump himself have repeatedly maintained that he is in perfect mental and physical health.  

The president the next morning followed up his bizarre post with a more typical post for Father's Day in his signature style of writing: 'Happy Father’s Day! Our Country is doing GREAT.'

'Record Jobs Numbers and Stock Market, BEST ECONOMY EVER! Greatest Military in the World, by far.'

'We are WINNING on all fronts, WINNING LIKE NEVER BEFORE. GOD BLESS YOU ALL!!! President DONALD J. TRUMP'.

Just days ago, the president was spotted with a new mark on his hand at the G7 summit.

A jagged purplish line was seen on the President's left hand as he gave a thumbs-up gesture during a working session with other leaders in Evian-les-Bains, France.

Trump's right hand is often seen covered with makeup to conceal discoloration, which he says is the result of frequent handshaking coupled with a high aspirin dose, making him more susceptible to bruising.

Trump, who celebrated his 80th birthday on June 14, recently released the results of his latest medical checkup, which he said went 'PERFECTLY.'

The President's physician, US Navy Captain Sean Barbarella, said in a memo last month that Trump 'remains in excellent health, demonstrating strong cardiac, pulmonary, neurological, and overall physical function.'

Presidents are not obliged to release their medical information to the public.

However, Trump has faced increased political pressure to publish his records after making Joe Biden's health a cornerstone of his presidential campaign, lashing his rival as 'Sleepy Joe' for failing to take a cognitive test.

Last year, after photos showed swelling in the President's ankles, it was revealed that he suffers from chronic venous insufficiency, a common circulatory problem in older patients.

Barbarella's report noted that the swelling has improved without going into detail.

Trump has also appeared to doze off in meetings with videos showing him closing his eyes during cabinet sessions and Oval Office announcements.

The President explained to the New York Magazine in a January interview that it's because the cabinet meetings are 'boring as hell.'

The Daily Mail has reached out to the White House for comment.