Trump’s trade tariffs are impacting the US and the global economy.

The US Supreme Court has questioned US President Donald Trump’s authority to use emergency powers to impose sweeping tariffs on trading partners around the world.

In a closely watched hearing on Wednesday in Washington, DC, conservative and liberal Supreme Court judges appeared sceptical about Trump’s tariff policy, which has already had ramifications for US carmakers, airlines and consumer goods importers.

The US president had earlier claimed that his trade tariffs – which have been central to his foreign policy since he returned to power earlier this year – will not affect US businesses, workers and consumers.

But a legal challenge by a number of small American businesses, including toy firms and wine importers, filed earlier this year, has led to lower courts in the country ruling that Trump’s tariffs are illegal.

In May, the Court of International Trade, based in New York, said Trump did not have the authority to impose tariffs and “the US Constitution grants Congress exclusive authority to regulate commerce”. That decision was upheld by the Court of Appeals for the Federal Circuit in Washington, DC, in August.

Now, the Supreme Court, the country’s top court, is hearing the issue. Last week, the small business leaders, who are being represented by Indian-American lawyer Neal Katyal, told the Court that Trump’s import levies were severely harming their businesses and that many have been forced to lay off workers and cut prices as a result.

In a post on his Truth Social Platform on Sunday, Trump described the Supreme Court case as “one of the most important in the History of the Country”.

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“If a President is not allowed to use Tariffs, we will be at a major disadvantage against all other Countries throughout the World,” he added.

What happened in Wednesday’s Supreme Court hearing, and what could happen if the court rules against Trump’s tariffs?