The electric car company led by Elon Musk builds all the cars it sells in the United States in California and Texas, shielding it from tariffs that could devastate competitors.

Donald Trump's support for Elon Musk's car company could end up hurting it. Tesla investors cheered Tuesday as Trump came to the defense of Musk's beleaguered and boycotted carmaker by lavishing the Tesla CEO with praise in a press conference as five Teslas lined up in the White House driveway.

After one of the worst single day sell-offs in Tesla's history, President Donald Trump threw his support behind his advisor, billionaire Elon Musk, vowing to buy one of his cars on Tuesday. Tesla has been pummeled this year under competition from rival electric vehicles,

Tesla backlash continues as the stock nosedives and Musk pushes conspiracy theories about protests and arsons at dealerships.

Tesla shares dropped more than 15% on Monday, making it the worst performer in the S&P 500 Index. Tesla’s stock has dropped by nearly half in three months. Even so, investors are still debating whether Elon Musk’s electric-vehicle maker remains overpriced.

Multiple factors have converged to drive down the price of Tesla stock by 50% since December. Here's how investors can manage their portfolios’ volatility.