The leading electric vehicle company is struggling, as its CEO just started feuding with the president of the United States.Tesla (NASDAQ: TSLA) has been on a tough path the last few years. It keeps losing share in its key markets around the globe, especially in the United States, a trend that looks set to continue even though it has slashed prices on its best-selling electric vehicles (EVs).Now, CEO Elon Musk has started publicly debating with President Donald Trump, and it is unclear whether this feud wil ...