Two dozen states in the US have sued the Trump administration, seeking to block the latest tariffs announced by the White House.
The lawsuit, filed on Thursday, adds to the uncertainties surrounding trade policy, after the Supreme Court ruled that many of the duties Trump had announced last year were illegal.
The White House swiftly responded by imposing a temporary 10% tariff under a different law - Section 122 of the Trade Act of 1974.
But the state officials, all Democrats, say that tariff is also illegal, arguing that the law was not meant to address trade imbalances.
According to the lawsuit, which is led by New York, California, Oregon and Arizona, the Trump administration's imposition of tariffs also violates the US Constitution because Congress, not the president, has the power to impose sweeping tariffs, which are taxes on imports.
