President Donald Trump has pushed into new trade law territory with an emergency sanctions law to justify punishing 25% tariffs on Canadian and Mexican imports and an extra 10% duty on Chinese goods to curb fentanyl and illegal immigration into the U.

Trump signed executive orders to impose tariffs on Mexico, Canada and China under the International Emergency Economic Powers Act (IEEPA), with a White House fact sheet claiming the move is meant to hold the US’ largest trading partners “accountable to their promises of halting illegal immigration and stopping poisonous fentanyl and other drugs from flowing into our country.

Canada’s prime minister and Mexico’s president ordered retaliatory tariffs on goods from the U.S., following through with their threats after U.S. Donald Trump sparked a trade war by imposing