More: Sources close to the elderly president, both inside and outside of the administration, told Zeteo the negative press coverage of his health angers him more than almost any issue other than the Jeffrey Epstein scandal.

"Trump will fixate on the offending news outlet or coverage for several days," the publication noted.

"He is sensitive to being compared, even if not explicitly, to Sleepy Joe," a Trump adviser said. "Especially if it's coming from a reporter he already hates."

Trump's frustration has grown as he faces increased scrutiny for exhibiting many of the same signs of physical and cognitive slippage he once mocked Biden for. Media coverage has picked up on Trump's display of troubling signs of mental decline, which has, in turn, fueled concerns about his fitness for the presidency.