The open acrimony between the two men comes after the billionaire denounced President Trump’s signature domestic policy bill as an “abomination.” President Trump and Elon Musk’s alliance dissolved into open acrimony on Thursday, as the two men hurled personal attacks at each other after the billionaire had unleashed broadsides against the president’s signature domestic policy bill. While meeting with Friedrich Merz, Germany’s new chancellor, in the Oval Office, Mr. Trump broke days of uncharacteristic silence and unloaded on Mr. Musk, who until last week was a top presidential adviser. “I’m very disappointed in Elon,” Mr. Trump said. “I’ve helped Elon...