The Supreme Court’s ruling that Trump exceeded his authority in imposing IEEPA tariffs was, at its heart, an invitation — perhaps even a requirement — for Congress to step up and play its constitutional role in trade policy. The court made clear that sweeping tariffs of the kind Trump had imposed require legislative authorization. With Trump now pressing forward under a separate, time-limited authority, the 150-day window before that authority expires creates a fixed deadline for congressional action.
Congress has historically been reluctant to engage directly in tariff policy, preferring to delegate broad authority to the executive and avoid the political difficulties of making specific trade decisions. That reluctance is understandable: trade policy creates winners and losers, and legislators from states with different economic profiles have different interests. But the Supreme Court’s ruling makes clear that the era of near-unlimited executive trade authority may be drawing to a close.
Business groups have been among the loudest voices calling for congressional involvement. Major trade associations see a congressionally authorized tariff framework as more stable, more predictable, and more legally durable than executive-driven tariff policy. They have been pressing lawmakers to use the 150-day window to debate and potentially authorize some version of Trump’s trade agenda — one that would survive future court challenges and provide the certainty that businesses need.
The political dynamics in Congress are complex. Many Republican legislators support Trump’s trade goals, even if they are uncomfortable with the methods. Democrats are largely opposed to the tariff agenda but have their own constituencies — particularly in manufacturing states — where some tariff protection enjoys popular support. Reaching a bipartisan deal that both authorizes an appropriate tariff framework and establishes clear limits on executive authority will require significant political will.
For global trading partners, a congressional role in US tariff policy would be broadly welcome. Tariffs anchored in legislation are more predictable, more stable, and more resistant to sudden reversal or escalation than those driven by executive action. Germany, France, the UK, and others have all called for certainty; a congressional framework would provide more of it than the current executive-driven approach. The 150 days ahead may be the most important period for US trade policy in a generation.