William and Kate could be set to do a royal tour of the US, in a move that would "rock" Harry and Meghan, a royal expert has said.Biographer Duncan Larcombe, author of Prince Harry: The Inside Story and who has joined approximately 30 official royal tours over the years has said that another royal visit Stateside could be in the works.In a chat with Closer magazine, he said that the prospect of William and Kate "going over there will no doubt rock" Prince Harry and Meghan Markle."A royal tour to the US is long overdue," he explained, adding: "They are our most important allies and there is a huge appetite for the royals over there."Royal tours take around six months to plan in secret, so it’s likely there’s one in the works to visit later.
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