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,

Musk has been able to play off Tesla's struggles for over a year now because the stock has been astonishingly resilient. Neither political gaffe nor falling deliveries has knocked Tesla off its upward trajectory, but Monday's selloff may be a sign of a changing sentiment.