Royal commentator Daniela Elser said the Duke and Duchess of Cambridge and the Queen have been "all over magazine covers" in America as she highlighted the "sustained public interest in the Windsors Stateside".

       Meanwhile Ms Elser claimed Meghan Markle and Prince Harry have "failed to build the sort of broad support base that many, including myself, expected them to".

       Writing for news.com.au, the royal commentator said: "In fact, next year could see a renewed Windsor assault on the US with news that the next outing of the Duke of Cambridge’s Earthshot Prize will be held in the States raising the possibility of a royal tour there also."

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