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What’s at stake as Trump’s tariffs face the US Supreme Court

    • The tariffs have remained in place to allow the Trump administration to appeal to the highest court, which is scheduled to hear arguments on Wednesday (Nov 5).
    • The tariffs have remained in place to allow the Trump administration to appeal to the highest court, which is scheduled to hear arguments on Wednesday (Nov 5). PHOTO: REUTERS
    Published Wed, Nov 5, 2025 · 06:59 PM

    [WASHINGTON] The fate of the majority of President Donald Trump’s tariffs is in the hands of the US Supreme Court after lower courts ruled that they were issued illegally under an emergency law.

    The tariffs have remained in place to allow the Trump administration to appeal to the highest court, which is scheduled to hear arguments on Wednesday (Nov 5).

    Which tariffs are under threat?

    Lower courts have struck down tariffs that Trump imposed by invoking the International Emergency Economic Powers Act (IEEPA). These include a minimum baseline tariff of 10 per cent on imports, with some exceptions; so-called reciprocal tariffs ranging from 10 to 41 per cent on goods from countries that failed to reach trade deals with the US; and extra levies on some imports from Mexico, China and Canada that Trump said were justified by the fentanyl crisis in the US.

    The Supreme Court case does not touch upon the duties imposed on certain product categories using different legal foundations. For example, the Trump administration has put in place levies on steel, aluminium, automobiles, copper products and lumber by harnessing Section 232 of the 1962 Trade Expansion Act. Those tariffs depend on Commerce Department investigations that concluded that imports of such products pose a national security risk.

    What powers does the president have to impose tariffs?

    Article one of the US Constitution gives Congress the power to levy taxes and duties, and to “regulate commerce with Foreign Nations.” But lawmakers have for decades delegated parts of their power over trade via various bits of legislation, most of which allow presidents to deploy tariffs only for limited reasons.

    While Trump tested the boundaries of those powers in his first term, this time around, he invoked what he claimed were virtually unlimited powers under IEEPA to impose tariffs via executive orders. The 1977 law had never been used for this purpose before and doesn’t mention tariffs.

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    IEEPA grants the president authority over a variety of financial transactions during certain emergencies, although the typical tool is sanctions. Trump cited US trade deficits with other countries and drug trafficking at the US border as national emergencies that allowed him to invoke the law to impose tariffs.

    What did the lower courts decide?

    The US Court of International Trade concluded that because of the Constitution’s “express allocation of the tariff power to Congress,” IEEPA does not “delegate an unbounded tariff authority to the President.”

    The ruling determined that Trump’s initial executive order announcing global tariffs, as well as his subsequent order imposing additional levies on imports from countries that retaliated, exceeded the president’s authority under the emergency law.

    A third executive order, hitting goods from Mexico and Canada with tariffs, was deemed to be illegal because those levies do not ultimately attempt to address the emergency used to justify them.

    The panel made clear that it wasn’t passing judgement on the “wisdom or likely effectiveness of the president’s use of tariffs as leverage.” Instead, the judges said that Trump’s imposition of tariffs was “impermissible not because it is unwise or ineffective, but because [federal law] does not allow it.” Their decision was affirmed by the US Court of Appeals for the Federal Circuit.

    In a separate case, a federal judge in Washington declared unlawful a number of Trump’s tariffs related to trade with China and other countries. US district judge Rudolph Contreras limited his decision to the pair of family-owned toy manufacturing businesses that sued.

    The combination of the two cases means the Supreme Court will be able to rule on the legality of the tariffs no matter which lower court was the proper venue for the challenge.

    If IEEPA-based levies go down, what are the implications for Trump’s tariff agenda?

    Not only would the administration no longer be able to collect IEEPA-based tariffs, it would face demands to refund those that have already been paid. The unravelling of a large portion of Trump’s tariffs could exacerbate concerns about the state of America’s public finances.

    Bond market investors, in particular, have been questioning the trajectory of the country’s mounting debt load. The administration had cited increased tariff revenue as a way to offset the tax cuts adopted in the tax and spending bill that Trump signed into law on Jul 4.

    At the same time, the loss of IEEPA-based tariffs might not be a permanent setback for Trump’s push to reshape global trade. Trump has other tools available to impose tariffs, such as his Section 232 national security powers, though they are more limited than what he attempted to use IEEPA for.

    To take similarly sweeping action, he could temporarily roll out import taxes of as high as 15 per cent for a maximum of 150 days using a provision of the Trade Act. But this can only be done unilaterally in the event of a “large and serious” US balance-of-payments crisis, to help correct an international balance-of-payments disequilibrium, or to prevent an “imminent and significant” depreciation of the US dollar.

    The administration could also initiate investigations into countries’ unfair trade and economic policies under Section 301, but those would take longer to implement. BLOOMBERG

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