Britain's Prince Charles, centre left and Camilla, the Duchess of Cornwall, second left are greeted by US President Donald Trump and first lady Melania Trump, outside Winfield House, the residence of the Ambassador of the United States of America to the UK, in Regent's Park, for the Return Dinner as part of his state visit to the UK, in London, Tuesday June 4, 2019. (AP Photo/Alastair Grant)