Trump Pushes Trade Law Boundaries with Canada, Mexico, and China Tariffs
President Donald Trump has ventured into uncharted legal territory by invoking an emergency sanctions law to justify imposing 25% tariffs on imports from Canada and Mexico, along with an additional 10% duty on Chinese goods. The move, aimed at curbing fentanyl trafficking and illegal immigration, is likely to face swift legal challenges that could set major precedents.
Legal and trade experts say that the 1977 International Emergency Economic Powers Act (IEEPA) has never been tested for imposing import tariffs. While past court rulings have granted U.S. presidents broad powers in emergencies, whether those powers extend to tariffs remains uncertain. As anticipated, Trump declared a national emergency under IEEPA on Saturday, citing an “extraordinary threat” posed by fentanyl and illegal immigration. The law grants the president sweeping authority to impose economic and financial sanctions in times of crisis—powers that have been used against adversaries like Russia in response to its war in Ukraine.
IEEPA provided Trump, now in his second term, with the fastest path to imposing tariffs, bypassing the lengthy investigations and public consultations required under trade laws he relied on in his first term for duties on steel, aluminum, and Chinese goods. “The courts have historically upheld the president’s power to take emergency actions, particularly when tied to national security,” said Tim Brightbill, co-chair of the international trade practice at law firm Wiley Rein. “The key question is whether that power extends to tariffs, given that IEEPA has only been used for sanctions.”
Legal experts expect affected companies and industry groups to challenge the tariffs in court, but they may struggle to win an injunction. “Judges are unlikely to second-guess a president’s definition of an emergency,” said William Reinsch, a trade expert at the Center for Strategic and International Studies. “An emergency is whatever he says it is.”
The closest historical parallel to Trump’s move dates back to 1971, when President Richard Nixon used IEEPA’s predecessor, the 1917 Trading With the Enemy Act, to impose a 10% across-the-board tariff on imports. Nixon justified the tariffs as a response to rising imports and a balance-of-payments crisis after the U.S. abandoned the gold standard. Courts upheld Nixon’s actions, but legal scholars argue that Trump’s situation differs significantly. Jennifer Hillman, a trade law professor at Georgetown University and former World Trade Organization appellate judge, points out that Nixon’s tariffs had a clear link between the problem—trade imbalances—and the solution. In contrast, Trump’s tariffs apply broadly to imports from Canada, Mexico, and China, regardless of whether they are linked to fentanyl trafficking or migration.
“For me, there isn’t a direct causal connection here,” Hillman said. “Tariffs on all goods are not ‘necessary’ to address fentanyl or illegal immigration. Nixon’s case was much clearer—imports directly affected the dollar’s value.” Trump previously threatened to use IEEPA in 2019 to impose 5% tariffs on Mexican imports over border migration issues but backed down after Mexico agreed to step up border security. In his first term, he also invoked the National Emergencies Act to divert federal funds for border wall construction.
If courts uphold Trump’s use of IEEPA for tariffs, lawmakers argue that Congress should reform the law to impose greater oversight. Peter Harrell, a national security lawyer and senior fellow at the Center for a New American Security, warned that allowing Trump to impose tariffs with a simple executive order would undermine Congress’s long-standing role in regulating trade. “At the very least, courts should recognize that letting Trump wield his Sharpie to sign an IEEPA order imposing tariffs would disrupt the balance of power Congress intended when delegating tariff authority to the president,” Harrell said.
Senator Tim Kaine, a Democrat, has already introduced legislation to restrict IEEPA’s use for tariffs, arguing that the law was never designed for such measures. “Virginians want lower prices, not higher ones,” Kaine said Saturday. “The last thing we need are new, senseless taxes on imports from our three largest trading partners.” As legal battles loom, Trump’s controversial trade maneuver raises fundamental questions about executive power and the future of U.S. trade policy.