The relationship between Mr. Trump and tech industry power brokers was built on money and the promise of deregulation, with Mr. Musk in the middle of it all.

Trumpworld insiders fear that Elon Musk’s attacks on Donald Trump’s “Big Beautiful Bill” could kill it—and are already advising candidates to turn their backs on the world’s…

As Elon Musk and Donald Trump take jabs at each other online, their respective businesses are plummeting in value.