Supreme Court Justices Question Trump’s Use of IEEPA for Tariffs

Web Editor

November 5, 2025

a man in a suit and tie with a percentage sign over a map of the world with money around him, Andrie

Background on the International Emergency Economic Powers Act (IEEPA)

The International Emergency Economic Powers Act (IEEPA) is a United States federal law that grants the President broad authority to regulate or prohibit transactions with foreign persons or countries when deemed necessary for national security reasons. The law was enacted in 1976, nearly 50 years ago.

Trump’s Tariff Initiatives

President Donald Trump has invoked the IEEPA to justify tariffs on various imports, citing concerns about fentanyl and migration, as well as efforts to reduce the U.S. trade deficit with countries like Mexico, Canada, and China.

Supreme Court Justices’ Concerns

During a recent hearing, Chief Justice John Roberts questioned Trump’s reliance on the IEEPA for imposing tariffs, arguing that taxation has traditionally been a congressional power and that the President’s use of tariffs could undermine this fundamental legislative authority.

Justice Sonia Sotomayor echoed this sentiment, stating that imposing taxes is the responsibility of Congress, not the President. She pointed out that tariffs are essentially a form of taxation.

Historical Context: Nixon and the International Trade Act of 1917 (TWEA)

In 1971, former President Richard Nixon used the International Trade Act of 1917 (TWEA) to impose a 10% tariff on all imports to the U.S., responding to a monetary crisis. The TWEA, similar in structure to the IEEPA, authorized the President to regulate international economic transactions.

Nixon’s tariff was presented as a regulatory measure rather than a revenue-generating one. However, the Supreme Court justices during the recent hearing questioned whether tariffs could ever be considered non-revenue generating, given their inherent nature as a form of taxation.

Key Questions and Answers

  • What is the International Emergency Economic Powers Act (IEEPA)? The IEEPA is a U.S. federal law that allows the President to regulate or prohibit transactions with foreign entities deemed a threat to national security.
  • Has the IEEPA been used for tariffs before? Although the IEEPA has never been explicitly used to impose tariffs, President Nixon utilized a similar law (TWEA) in 1971 to impose a 10% tariff on imports during a balance of payments crisis.
  • Why are Supreme Court Justices concerned about Trump’s use of IEEPA for tariffs? The justices argue that taxation is primarily a congressional power, and using tariffs as a means to achieve policy goals could infringe on this legislative authority.