Prince Harry and Meghan Markle are an "insult to the nation they abandoned" according to US journalist Lee Cohen.
He spoke to GBN America about an opinion piece he wrote about the popularity of the Sussexes, not only with the public, but with the Royal Family themselves.
This follows claims that Harry told friends he would "step into a royal role" while his father takes a break from public duties after announcing his cancer diagnosis.
The Duke recently told ABC's Good Morning America that he plans to see his family "as much as he can" following the King's diagnosis, and hopes the illness can "bring the family together".
Lee Cohen gave his insight into the Sussexes
GB News
He said he "loves his family", but also "has his own family" in California.
Speaking to GBN America, Cohen said: "I wrote in the piece that against criticism for these ridiculous rebranding efforts, the Sussexes defiantly vow not to be broken.
"But in fact, they have broken themselves through their transparent treachery that Brits have long known and Americans have finally woken up to.
"During Harry's interview on Good Morning America, he professes love for his family following the King's cancer diagnosis, which is a reasonable reaction.
Prince Harry has reportedly said that he may return to the Royal Family
Getty"But this statement is mystifying considering the multitude of offences and disrespects committed by the Prince and his wife against the Royal Family. I mean, it's just shocking, isn't it?
He added: "It's astonishing. Their vendetta against the family and institution of monarchy is no mere family feud.
"Because the Royal Family represent the British nation.
"So it really is an insult to the nation.
Lee Cohen spoke to GBN America
GB News
A royal insider has talked up the prospect of a royal reconciliation, saying: "Much has been said on both sides in recent years.
"But that has never diminished the fundamental bond of blood.
"There are now pragmatic aspects to consider, with the King and Kate’s wellbeing paramount in this."
The insider made clear that details of the Clarence House meeting between Harry and King Charles are "private", but admitted there is a "feeling that this arrangement could work".