US stocks fall on new Trump tariff probes under Section 301
Administration launches investigations targeting digital services taxes and currency manipulation following Supreme Court tariff ruling
US stocks declined on Wednesday as the Trump administration announced new tariff investigations under Section 301 of the Trade Act, reigniting investor concerns about trade tensions after a brief period of relief following a Supreme Court ruling.
The probes target multiple countries over alleged unfair trade practices, including digital services taxes and currency manipulation, according to reports from the Wall Street Journal. The move comes after the Supreme Court invalidated previous tariffs imposed under the International Emergency Economic Powers Act (IEEPA), forcing the administration to pursue alternative legal authority for trade enforcement.
The new Section 301 investigations establish the groundwork for fresh import levies that could have broad implications across multiple sectors. Historically, US equities have reacted negatively to tariff announcements, with large-cap stocks typically falling on the day such measures are announced. During President Trump's second term in early 2025, a series of tariff announcements contributed to the S&P 500 index dropping nearly 20% over seven weeks.
In response to the Supreme Court's February ruling, the administration swiftly implemented temporary tariffs under Section 122 of the Trade Act of 1974, effective February 24. Those measures initially imposed a 10% duty on most imports, with the possibility of increasing to 15%, and are set to expire on July 24 unless extended by Congress, according to trade compliance trackers.
The new Section 301 probes add another layer of complexity to the trade landscape. The US Trade Representative delivered President Trump's 2026 Trade Policy Agenda earlier in March, reaffirming commitments to existing Section 301 actions targeting China's compliance with the Phase One Agreement and its practices in areas including shipbuilding and semiconductors. As of March 6, a separate Section 301 investigation was already targeting Chinese vessels and port entry fees.
Market analysts warn that continued trade policy uncertainty and tariffs will likely contribute to higher inflation without necessarily fostering corresponding economic growth. J.P. Morgan projected that increased tariffs on Chinese imports could lead to a 40-basis-point rise in prices over the next two years. This inflationary pressure could influence the Federal Reserve's interest rate decisions, potentially limiting their ability to cut rates.
The immediate market reaction to Wednesday's announcement reflected ongoing jitters among investors who have been navigating shifting trade policy throughout the administration's second term. Companies with significant exposure to imported goods and international supply chains, particularly in retail and technology sectors, faced some of the steepest declines.
Section 232 tariffs, which are based on national security grounds, remain in effect, while the administration considers additional Section 301 actions addressing issues such as global overcapacity, unfair agricultural policies, and pharmaceutical pricing. Together, these measures suggest trade tensions will remain a persistent headwind for markets through 2026.