U.S. President Donald Trump on Tuesday vowed to hit the European Union with tariffs and said his administration was discussing a 10% punitive duty on Chinese imports because fentanyl is being sent from China to the U.

Trump underscored his intention to use tariffs as a tool of international economic policy and an increasingly vital source of government revenue.

Trump said in an Oval Office signing ceremony on Monday that his administration will impose a 25% tax on goods from Canada and Mexico that may come as soon as February 1 – a move that could raise prices for American consumers.