Donald Trump was saved from embarrassment on Monday by his wife Melania when she reminded him that a statue they were shown at Buckingham Palace by the Queen had in fact been gifted by the American president and his consort of last year's visit to the UK.
The couple were being shown around the palace on the first day of their visit to the UK.
Mr Trump was being shown around a gallery at the palace of American artefacts when he was asked by Queen Elizabeth whether he recognised the pewter horse, to which he replied 'No'. Melania quickly interjected: "I think we gave that to the Queen".
The pair visited Windsor last July and gave the statue as a gift on that occasion.
Other items in the gallery included golf memorabilia, which would have been certain to turn the head of the president, who plays the game and owns several courses.
There was also a copy of a telegram which was sent to George VI, the queen's father, from General Dwight Eisenhower after Allied forces had landed in Normandy on D-Day in June 1944.
This week there will be ceremonies in the UK and France to mark the 75th anniversary of the landings, which will be attended by the president and other leaders from across Europe and the world.