Reporter Maureen Groppe explains the significance of the tariffs case being heard at the Supreme Court that could define Trump's presidency.

It’s one of the most significant economic cases to reach the Supreme Court in years – the blockbuster battle over President Donald Trump’s sweeping global tariffs – but the nation’s largest companies are sitting on the sidelines.

A ruling striking down Trump's use of the 1977 International Emergency Economic Powers Act, or IEEPA, to quickly impose broad global tariffs also would eliminate a favorite cudgel to punish countries that draw his ire on non-trade political matters.

The justices will hear arguments Wednesday on the legality of most of the president’s tariffs — the first in a series of tests of sweeping claims of authority.

Supreme Court to hear landmark case challenging Trump's trade tariffs under emergency powers act, with billions in revenue at stake for government.

A Chicago-area toy company is among the businesses arguing to the justices this week that most of the president’s tariffs should be struck down.

In just a few days, the Supreme Court will start hearing arguments in what President Donald Trump is calling “one of the most important cases in the history of our country.”

The Supreme Court will decide whether Trump's tariffs under the IEEPA were legal, a ruling that could expand or limit presidential trade authority.