Meghan Markle and Prince Harry have suffered a blow as Princess Kate and Prince William are set to make a major move in the US, according to new claims. The Prince and Princess of Wales have set their sights on the Duke and Duchess of Sussex’s home turf as they relaunch plans for their charitable foundation in the US. The royal couple have registered the foundation’s brand with the American trademark authorities, according to reports in The Mail. The Prince and Princess of Wales are believed to have begun working on the initiative towards the end of their summer holidays. Their foundation’s fo…