American presidents have travelled to Britain to meet the Royal Family for more than 100 years.
Donald Trump will meet King Charles for the second time when he arrives in Windsor on Wednesday, having been hosted by the late Queen Elizabeth II on his previous state visit during his first term.
For the King, it will be the first time he welcomes a US president as monarch.
Some presidents' visits have run more smoothly than others. Here, we look back at some of the most memorable.
Woodrow Wilson was the first US president to visit the Royal Family while in office, making the long journey on SS Washington in December 1918 - weeks after the First World War came to an end.
Image: President Woodrow Wilson and King George V outside Buckingham Palace. Pic: PA
Arriving in London on