Tesla shares dropped over 6% amid a sell-off on Wednesday after the White House announced auto tariffs.The decline in Tesla shares also affected the overall tech sector, causing a broad sell-off in tech stocks.Nvidia faced an additional setback as it could face regulatory hurdles in China, which led to a 6% drop in its shares.The S&P 500 and Nasdaq Composite both dropped, with the S&P 500 on track to snap a three-day winning streak.