President Donald Trump drew swift backlash online Monday after claiming in a Truth Social post that filmmaker Rob Reiner and his wife Michele were killed because of Reiner’s opposition to him in what he called an “incurable” case of “Trump Derangement Syndrome.”

Reiner and his wife were found dead in their Brentwood home on Sunday with wounds consistent with a knife attack, one source told TheWrap on Sunday. Police arrested the couple’s son, Nick Reiner, on Sunday night, according to media reports.

“Rob Reiner, a tortured and struggling, but once very talented movie director and comedy star, has passed away, together with his wife, Michele, reportedly due to the anger he caused others through his massive, unyielding, and incurable affliction with a mind crippling disease known as TRUMP DERANGEMENT SYNDROME,” Trump posted to Truth Social Monday. “He was known to have driven people CRAZY by his raging obsession of President Donald J. Trump, with his obvious paranoia reaching new heights as the Trump Administration surpassed all goals and expectations of greatness, and with the Golden Age of America upon us, perhaps like never before. May Rob and Michele rest in peace!”