But the justices were openly doubtful about the president's claim that he has the power to impose tariffs under the International Economic Emergency Powers Act, known as IEEPA, a statute that, as Chi...

President Donald Trump has worked fast in his second term, wielding unilateral power to reassert American dominance in the global economy.

If the justices strike them down, "we would be defenseless, leading perhaps even to the ruination of our Nation," Trump wrote in a social media post on Sunday.