Dow, S&P 500, and Nasdaq futures are falling in premarket trading. An Nvidia-led rally fades as the stock market react to President Donald Trump threating a 50% tariff on goods from Brazil.

As chief executive of Elon Musk's X, Linda Yaccarino navigated two turbulent years of charm offensives and legal threats to stabilize a bruised business-just in time for Musk's merger of X with xAI.