Tesla warned of the hit to its bottom line from tariffs, while SpaceX complained that foreign trade barriers affect its Starlink internet satellite service.

While Elon Musk has emerged as one of President Donald Trump's most loyal supporters—backing his policies and contributing over $300 million to his reelection campaign—the tech mogul's companies are now fearful of the unintended consequences of the administration's aggressive trade measures.

Elon Musk is just a little bit less rich today. Wednesday finds Musk, the world’s richest man, with his pockets approximately $110.8 billion lighter than his peak net worth of $464 billion, recorded on December 17,