Elon Musk's empire isn't exactly crumbling, but it looks increasingly vulnerable as his falling out with President Trump intensifies.Why it matters: The world's richest person enjoyed ballooning wealth in the early days of his alliance with the president,

Mr. Musk’s involvement in politics and his financial support for the president’s campaign was once seen by investors as a benefit to Tesla, fueling a steep rise in company shares after the election last year. That association has now turned into a liability. Tesla shares are down 40 percent from their peak in December.