It is seen as President Donald Trump's potentially biggest legal setback since becoming president if the Supreme Court rules against him. Trump himself said in a statement that "We're screwed" if the ruling does not go his way.
Now, however, he must wait at least until Tuesday next week, as the Supreme Court has chosen not to take a position this time; a first opportunity was already given last week.
The Supreme Court never announces in advance which decisions will be issued on each individual occasion, only that judgments are possible on what is called a "decision day".
The background is that more than 1,000 U.S. companies have pursued the case in court and sought compensation for the global tariffs that Trump announced in April last year, in connection with what he called "Liberation Day".
Tariffs are ordinarily decided by the U.S. Congress, but Trump argued that he had the power to impose tariffs based on what he considered to be an economic emergency.
If the companies prevail, it could mean refunds of around $130 billion.
