On Monday, Trump posted an image with a map of North America, showing countries like Canada, Greenland and Iceland coloured in with the American flag.

A letter sent to senior government officials said the couple — who gave up their royal duties and moved to California more than six years ago — will not undertake royal duties.

Silvia Larrieu said her uncle, Mario Lamar, was piloting the plane that was also carrying Lamar's wife Lily Lamar and two of his grandchildren, Christian Sosa and Sophie Sosa.