Elon Musk has staked out a big claim in the auto industry, outer space and, now, in Donald Trump’s new administration. But even some of his allies are beginning to wonder if it is all too much for the world’s richest man.

Elon Musk has staked out a big claim in the auto industry, outer space and, now, in Donald Trump’s new administration. But even some of his allies are beginning to wonder if it is all too much for the world’s richest man.