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.

A new political party is needed in America to represent the 80% in the middle!” Musk said, reacting to the results of his Thursday, June 5, poll. “A