Fox News contributor Andrew McCarthy said Friday that President Donald Trump has an “ancient feud” with his former national security adviser John Bolton — and decried the FBI raid on Bolton’s Bethesda, Maryland home.

Federal agents conducted the court-authorized search as part of a revived investigation into whether Bolton had mishandled classified records, according to multiple news reports. Bolton told CNN the search surprised him, and said he’s “looking into it further.”

“Well, you know, look, this is a very sad development,” McCarthy said Friday during an appearance on Fox News. “It’s one we’ve seen again and again, but this is an ancient feud. It’s all, I think, over Bolton’s book. Bolton went on a jihad against Trump after he got fired.

“There was major controversy over whether he had included classified information in the book, whether he had mishandled notes that he took at meetings, and stuff that ended up in his memoir,” he continued about Bolton’s 2020 memoir, “The Room Where It Happened: A White House Memoir.”

McCarthy, a former assistant U.S. attorney for the Southern District of New York, noted that the book was rather substantial and included “a lot of quotations” — and argued that these “must have been difficult to include from memory” alone.