Meghan is still a U.S. citizen because the process to become a fully-fledged Briton is expected to take three years. She is expected to retain her U.S. citizenship, as dual citizenship is permitted. Presidential candidates must be U.S. citizens.

Meghan has cultivated a warm friendship with former U.S. president Barack Obama and his wife, Michelle, while chat show host Oprah Winfrey, who is one of the most influential women in America, was given a prime seat at St George’s Chapel Windsor, opposite the Royal Family.

A royal historian says Meghan would find it difficult to enter U.S. politics while still married to Harry. ‘It is a pretty strong rule that members of the Royal Family keep out of politics,’ he says.

But Harry could, of course, give up official royal duties. His mother, Princess Diana, was said to have considered moving to America.