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 ruli

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