The ruling opens the door to potentially hundreds of billions of dollars in tariff refunds.

The decision is a stinging defeat for Trump — and three conservative justices voted against him.

The decision is a significant loss to US President Trump on an issue that has been critical for his economic agenda.

Ruling is blow to Trump’s bold assertions of authority and topples key pillar of aggressive economic agenda

Trump, as recently as Thursday, has talked up the consequences of the Supreme Court striking down his tariffs prior to the seismic ruling.

Supreme Court Justice Brett Kavanaugh, in his dissent, warned that "the refund process" for tariffs "is likely to be a 'mess,' " citing oral arguments

The Supreme Court ruled against a centerpiece of President Donald Trump's tariff agenda on Friday. Consumers could save money as a result, economists said.

Refunds for importers and negotiations for new trade deals are among issues to watch after the Supreme Court overturned Trump's tariffs.

The Supreme Court has weakened Trump's hand in dealing with other nations, writes Anthony Zurcher.

The ruling opens the door to potentially hundreds of billions of dollars in tariff refunds.

In a 6-3 vote, the conservative-led High Court disputed Trump’s argument that a 1970s law gave him the power to impose tariffs

The US Supreme Court ruled that 'reciprocal' tariffs imposed by the American president were illegal.

6-3 ruling against unilateral imposition of tariffs without congressional approval labelled a ‘disgrace’ by Trump

The case is the first major challenge to Trump’s agenda, but he still has other avenues to pursue trade restrictions.

The decision adds to economic uncertainty, as deals Donald Trump struck with other countries are upended

The Supreme Court's decision has led questions over whether people can get a refund over the unlawful tariffs.

Some countries welcome the ruling, while others review trade deals and economic effect.

The US supreme court ruled against the president. Let’s hope the court removes its pro-Trump glasses on other issues and stands up for the rule of law

What's far less certain is the longer-reaching impacts as the economy and markets again adjust to a changing landscape.

The decision on the tariffs was made 6-3. So, how did each of the nine justices vote?

The U.S. Supreme Court on Friday struck down much of President Donald Trump's "reciprocal" tariffs. But Trump didn't take their decision lying down.