According to a report by the US World News Network on April 5, Musk, the billionaire who heads the Department of Government Efficiency in the Trump administration, made a rare public attack on the inner circle of the Trump administration as the tariff war caused the Wall Street stock market to plunge. Peter Navarro, Trump's senior adviser on trade and manufacturing, tried to play down market concerns over the damage caused by the tariff war in the past two days on CNN. After Navarro insisted that tariffs would eventually win good results, Musk publicly mocked Navarro on his social platform X. He replied to a post mentioning that Navarro has a doctorate in economics from Harvard University: "Having a doctorate in economics from Harvard is not a good thing, but a bad thing. Causes arrogance or brain problems. "One user responded that Navarro was" correct ", and Musk replied: He" has achieved nothing ". (Every story)