The United States Supreme Court’s application of the “major questions doctrine” could influence the status of tariffs imposed by President Donald Trump.

This doctrine restricts federal agencies from making significant economic or political decisions without clear congressional approval.

A recent ruling by the US Court of International Trade referenced the doctrine while invalidating several of Trump’s tariffs for exceeding congressional authority.

These tariffs were projected to amount to US$1.4 trillion over the next decade.

They were enacted under the 1977 International Emergency Economic Powers Act to address what Trump termed an economic emergency.

🔗 Source: Bloomberg

🧠 Food for thought

1️⃣ The major questions doctrine represents a significant power shift in American governance

The doctrine’s emergence marks a transfer of authority from agencies to courts, fundamentally reshaping how government operates on significant issues.

The MQD evolved from early cases like Brown & Williamson v. FDA to become a central judicial tool in West Virginia v. EPA and Biden v. Nebraska, representing a departure from decades of courts generally deferring to agency expertise 1.

When applied, it creates a strong presumption against agency authority on economically or politically significant matters unless Congress has provided explicit authorization 2.

This shift has occurred along ideological lines, with all six conservative justices supporting the doctrine while liberal justices have uniformly opposed it, describing it as a tool that allows conservative justices to selectively interpret statutory text when it serves their purposes [original article].

The doctrine’s emergence reinforces a broader trend toward judicial supremacy in determining the boundaries of executive power, effectively transferring significant decision-making authority from executive agencies to the courts.

2️⃣ The Trump tariff case presents the first major test of ideological consistency

The tariff challenge will reveal whether the Court applies the same doctrine consistently across administrations regardless of partisan alignment.

The economic scale of Trump’s challenged tariffs—estimated at $1.4 trillion over a decade—significantly exceeds the $400 billion Biden student loan package that Chief Justice Roberts described as having “staggering” significance when striking it down [original article].