Elon Musk’s bitter falling-out with President Trump could be costly for Tesla. As long as he is persona non grata in the Trump administration, Mr. Musk, the chief executive of Tesla, will struggle to persuade Republicans not to gut climate policies worth billions of dollars to the electric car and battery company.

Elon Musk had advocated ending the $7,500 tax credit for buyers of Tesla and other automakers’ EVs. But with the end of that credit included in the the “big, beautiful bill,” he and the now financially struggling Tesla are arguing for its continuation.