President Donald Trump’s sweeping tariffs took effect Wednesday over the concerns of many of the nation’s billionaires, as even longtime supporters of the president—including Elon Musk—have expressed concern about the tariffs and their impact on the economy.

Elon Musk took another jab at President Donald Trump’s senior trade adviser Peter Navarro Tuesday, calling him a “moron” on social media as the Tesla CEO further splits from the White House’s tariffs plan.