US stock market loses $4 trillion in value as Trump plows ahead on tariffs

President Donald Trump's tariffs have unsettled investors, with concerns about an economic downturn fueling a stock market sell-off that has erased $4 trillion from the S&P 500's peak last month, when Wall Street was optimistic about much of Trump's agenda.

A series of new policies from Trump has heightened uncertainty for businesses, consumers, and investors, particularly the ongoing tariff disputes with major trading partners like Canada, Mexico, and China.