The clash over Community Notes is only the latest chapter in a bitter personal feud. Earlier this year, Navarro derided Musk as “a car assembler” whose supply chains depended on China. Musk retaliated with some of his harshest language yet, calling Navarro “dumber than a sack of bricks” and “truly a moron,” even mocking his Harvard PhD as “a bad thing.” He joked that Navarro should consult “Ron Vara” — the fictional expert Navarro once invented to bolster his anti-China arguments.