Court Looks to Move Fast Ruling on Trump’s Tariffs: Supply Lines

Friday Aug. 1 has been marked on calendars across financial markets, customs compliance offices and government trade departments for weeks since US President Donald Trump declared it the final deadline to do a deal or face his unilateral tariffs.

But there’s another, lesser-known day to notch on the diary next week that may prove illuminating on a basic question: whether Trump will be legally allowed to slap all these discretionary tariffs on America’s trading friends and enemies using an authority facing scrutiny in two federal courts.

On Thursday July 31, oral arguments are scheduled on Trump’s appeal of one of ...