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.

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

As Elon Musk pivots away from Washington and back to his companies including Tesla, experts say he will have to address several challenges.