WASHINGTON — Some two dozen states challenged President Donald Trump’s new global tariffs on Thursday, filing a lawsuit over import taxes he imposed after a stinging loss at the Supreme Court.

The Democratic attorneys general and governors in the lawsuit argue that Trump is overstepping his power with planned 15% tariffs on much of the world.

Trump has said the tariffs are essential to reduce America’s longstanding trade deficits. He imposed duties under Section 122 of the Trade Act of 1974 after the Supreme Court struck down tariffs he imposed last year under an emergency powers law.

Section 122, which has never been invoked, allows the president to impose tariffs of up to 15%.

The lawsuit is led by attorneys general from Oregon, Arizona, California and New York.

“The focus right now should be on paying people back, not doubling down on illegal tariffs,” said Oregon Attorney General Dan Rayfield. The suit comes a day after a judge ruled that companies who paid tariffs under Trump’s old framework should get refunds.