'Racist' comments made by Prince William's godmother are a 'disaster' for him and Kate as they head to the US today for their first trip in eight years, PR experts said today.

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Publicist Mark Borkowski said the comments, which were made at a reception organised by Queen Consort Camilla, would serve as 'ammunition' for Meghan and Harry - who today released a polished trailer for the Invictus Games on the same day William and Kate began their US visit.

Mr Borkowski told MailOnline: 'This is a PR disaster for the Royal Family and it is going to cause huge problems, especially at the start of William and Kate's US trip which will be dominated by a new racism row. They are flying into a perfect storm.

'It is also ammunition for Meghan and Harry who can now tell Americans they have been proved right and say: 'Look we told you so' when they are on their own PR blitz with their Netflix show out next week and their Invictus promotions.

'This scandal is the first real big test and crisis of Charles' reign. He must be ruthless in throwing this old guard out of the royal household. The optics are very bad at this time when the King wants to create an image of a new, modern, Royal Family'.