Over the weekend, as Elon Musk launched into a barrage of social media posts criticizing one of the lead White House advisers for President Donald Trump’s aggressive tariff plan, Musk was going over that same official’s head — and making personal appeals to Trump.

Economic experts have continuously cautioned that Trump’s tariffs will likely lead to increased costs for American consumers and a prolonged period of economic uncertainty.

Navarro, widely seen as the architect of Trump's tariff plans, told CNBC Musk had done a good job with his work to streamline government, but his opposition to duties was not surprising, the latest salvo in a growing feud between the Trump advisers.