King Charles is "paralysed by fear" when dealing with Meghan Markle and Prince Harry according to a royal commentator.
Tom Bower stated King Charles is aware that exploiting Meghan and Harry's popularity will boost the status of the Royal Family despite the couple's "humiliating" attacks on the Firm.
However, the monarch also risks allowing the Duke and Duchess of Sussex to take the attention from his crowning by allowing the them to attend the ceremony.
Tom Bower said: "Exploiting their popularity at the Coronation will boost Charles’s status.
"But that advantage will evaporate if the Duke and Duchess of Sussex grab the public’s attention over that weekend.
"Ever since Megxit, Meghan and Harry have humiliated the King and the Royal Family.
"Paralysed by fear and indecision, Charles has failed to suppress the Sussexes’ vile vitriol."
He added in his article for The Sun: "In calculating whether to allow the Sussexes to attend his Coronation, Charles has reverted to his familiar stance — dithering, worrying about his image."
It comes as another royal author claimed Meghan Markle and Prince Harry are set to be offered another olive branch by the King in a "recurring theme of his life'".
Author Gareth Russell highlighted King Charles's approach to Edward VIII and Wallis Simpson as sign of his willingness to build brides with members of the Royal Family.
Edward VIII ascended to the throne in January 1936 following the death of King George V.
However, Edward chose to step down as the UK's head of state in December 1936 to marry Wallis Simpson when he was asked to pick between the two.
The pair married in 1937 and were granted the titles of the Duke and Duchess of Windsor but Edward did not retain the power and status he once had.
Speaking to US Weekly, Russell said: "This has been a recurring theme in his [King Charles] life, actually.
"I found out that in the late 1960s, and early 1970s, when Charles was still pretty young, he was one of the only members of the Royal Family who was prepared to go over to Paris to visit his great-uncle, Edward VIII, and Wallis Simpson.
"He said to the Queen Mother and to the Queen, 'I think we should try to build bridges between this side of the family'.
"He thought his great-uncle and aunt should be brought back into the fold a bit. So there is a past track record of Charles doing things like this and, in that sense, it tracks as consistent with what we know of him as a person."
