Royal experts have criticised Oprah for suggesting Meghan Markle was "silenced" by the Royal Family.
On Sunday the Duke and Duchess of Sussex's interview with the TV show host will air on CBS.
The first look at the programme came in a teaser trailer broadcast on Sunday night during the US TV show 60 Minutes.
In the trailer, Oprah is seen telling Meghan: “You’ve said some pretty shocking things here.”
She later asks: “Were you silent or were you silenced?”
The trailer has been criticised by advocates of the royal family, including Robert Jobson, a biographer of Prince Charles and the Duke of Edinburgh.
As well as knocking the tone of the trailer, he questioned the suggestion that Meghan was treated in a Mafia-like way.
"The Queen and the Royal Family are not the Corleone family of Windsor," he told Mail Online.
"There are no hit men or heavies going around silencing people."
He went on to suggest that talk of her being silenced was "ridiculous".
Royal expert Richard Fitzwilliams questioned why the programme has been extended to two hours from the original one and a half hours as was planned.
"Was this because Harry and Meghan were angry at having their patronages removed or had it always been planned?" he questioned.
In the trailer the Duke of Sussex also describes leaving the Royal Family as "unbelievably tough".
Oprah promises viewers there will be "shocking" revelations and "no subject off limits".
At one point the 67-year-old turns to Meghan, 39,and says that her situation was “almost unsurvivable... sounds like there was a breaking point”.
Harry sits with his pregnant wife in the garden of their £11million Montecito home in California.
The Duke, while holding his wife’s hand, is heard claiming he emigrated to LA with his family because he feared “history repeating itself” after the death of his mother, Princess Diana.
Keep up to date with all the latest news from the Queen, Charles, William, Kate, Harry, Meghan, George, Charlotte, Louis, Archie and the rest of the family.
We'll send the best Royal news directly to your inbox so you never have to miss a thing. Sign up to our newsletter here.
Meghan, who is seen cradling her bump while wearing a £3,400 Armani dress and a bracelet belonging to Diana, only says “yeah” in the trailer.
Meghan and Harry have individual interviews with the chat show host, who attended the couple’s May 2018 wedding at Windsor Castle, and then a joint one.