Royal commentator Omid Scobie insists there will be a "serious problem" if it transpires a future king made the racist skin colour comment about Meghan Markle and Prince Harry's son Archie.
The co-author of controversial Megxit biography Finding Freedom spoke in Three's special programme After The Interview on Tuesday night, following the royal bombshells dropped in Meghan and Harry's tell-all interview with Oprah Winfrey.
During the CBS special, Meghan claimed there had been "concerns and conversations" about how dark the colour of Archie's skin would be when he was born. The Duchess of Sussex said that the issue had been raised with her husband Prince Harry, who relayed the information back to her.
- CBS Presents Oprah with Meghan and Harry can be watched in full on ThreeNow.
Scobie, who is also the royal editor for Harper's Bazaar, said that it "wasn't surprising" to hear revelations of racism within the royal family, but that it did need to be addressed.
"We don't know who it is, but obviously there is a lot of speculation, and Harry himself has ruled out the Queen and Prince Philip," Scobie said.
"Many say that only leaves Prince Charles and Prince William. If we are talking about a future king, then it is something that the palace needs to deal with."
"For Britain, an incredibly diverse country, to know that their reigning monarch could potentially be a racist or have racist views, is a serious problem," he added.
Both Harry and Meghan declined to name the royal who made the comments, with Meghan declaring it would be "too damaging", and Harry insisting he would "never share" the details of what happened.
Despite this, Winfrey later told CBS This Morning that Harry had asked her to share with the press that neither the Queen nor Prince Philip were involved in the conversation.
Elsewhere in the interview, Harry said he felt "let down" by his father Charles, who is next in line for the throne, after he cut him off financially and stopped taking his calls.
Harry also said he and his brother William, who is second in line to be king, were taking "space", and that he hoped "time would heal all things" in reference to a rumoured rift between the brothers.
Scobie said that he thought Harry and Meghan "would have been reluctant to start this chain of events" adding: "This is really just the beginning now."