Elon Musk took to X to fire off a slew of posts against Peter Navarro, the president’s top trade adviser, with one calling him a ā€œmoron.ā€

Musk’s tirade came Tuesday, a day after Navarro went on CNBC and called Musk a ā€œcar assembler,ā€ per Mediaite.

ā€œWe all understand in the White House (and the American people understand) that Elon’s a car manufacturer, Navarro said. ā€œBut he’s not a car manufacturer — he’s a car assembler, in many cases.ā€

ā€œIf you go to his Texas plant, a good part of the engines that he gets (which in the EV case are the batteries) come from Japan and come from China,ā€ Navarro added. ā€œThe electronics come from Taiwan.ā€

Musk has previously Navarro’s tariff-heavy trade plan.

Musk volleyed back at Navarro by saying he is ā€œtruly a moronā€ on X.

Musk continued with more posts.

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In one post, Musk called Navarro ā€œdumber than a sack of bricks.ā€

In another post, Musk referred to Navarro as ā€œPeter Retarrdo.ā€

Navarro recently questioned Musk’s ā€œself-interests as CEO of Tesla are driving his apparent skepticism about tariffs,ā€ per the outlet.

ā€œEvery country around the world cheats us,ā€ Navarro said. ā€œBut it’s like fingerprints — they all do it in different ways. But it all comes down to the non-tariff cheating. It was interesting to hear Elon Musk at the beginning talk about a zero-tariff zone with Europe. He doesn’t understand that. And the thing that’s, I think, important about Elon to understand, he sells cars. That’s what he does.ā€

Navarro continued, saying he had no beef with Musk.

ā€œThere’s no rift here. Look, Elon, he’s got X, he got a big microphone. We don’t mind him saying whatever he wants, but just the American people need to understand that we understand what that’s all about, and it’s fine. It’s fine,ā€ Navarro said.