Princess Diana’s brother isn’t holding back.

Charles Spencer responded to Buckingham Palace’s extraordinary statement regarding a claim made in his new book, “Swan Song: Diana, My Sister.”

In an excerpt of the book published by the Daily Mail ahead of its Sept. 22 release, Spencer claims that he had a conversation with the then-Prince Charles hours after Diana’s death, in which he reportedly said, “We’ll forget her soon enough!”

Buckingham Palace issued a rare statement in response to that claim, telling HuffPost last week: “While we do not comment on books as a matter of principle, His Majesty is mindful that the pain of fraternal grief can cloud reason, affect judgment and color memory in ways others do not recognize, even many years after such a loss.”

When asked to comment on the palace’s response, Spencer told ABC’s Maggie Rulli that “it’s not every day you’re gaslit by a king.”

Spencer said in the interview, which aired on Monday, “I was really upset with that because I thought it was very, not only condescending, but not straight.”

“What I said is straight and true. And what did they come back with? That. It doesn’t say he didn’t say it either,” Spencer pointed out. “That’s what I found interesting. I was really shocked, actually.”

Earl Spencer also spoke to the BBC last week about the astonishing response from the palace.

“I can tell you here and now, those are exactly the words he said,” the 62-year-old shared.

“I’ve only ever had two calls on the line with Prince Charles at any stage of my life,” Spencer recalled. “I was hyper alert to what he was saying and those are precisely the words that he said and I promise that to you now. Genuinely, that is what he said. I don’t hear him saying he didn’t say that.”

In a new interview with People magazine, Spencer was asked if he had “any fear about writing so candidly about someone who is now The King?”

He said in the interview, published on Monday, “Not really, no. I respect the institution of the Crown, and I know that most people in Britain do, especially the older generation, but when I’m writing this book, I’m not interested in who people are in terms of status.”

“I’m looking at them as people. And the central person, the only one that really matters, is Diana,” he said. “It was very important actually in the book to explain why things turned out as they did.”

HuffPost has again reached out to Buckingham Palace regarding additional claims made by Spencer, though they are not expected to comment further.

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