Musk” sentiment is a “major factor” in the potentially weak Tesla first-quarter vehicle delivery number due Wednesday.

Tesla's first-quarter sales slumped 13%, its weakest performance in nearly three years, as backlash to CEO Elon Musk's embrace of far-right politics grows and as consumers seek out newer models from rival electric-vehicle makers.

Shares of Tesla fell more than 2% on Wednesday as the company recorded a bigger-than-expected drop in sales in the January-March period.