DONALD Trump's sweeping global tariffs are now at risk after a court has said he doesn't have the power to impose the levies himself.

A US federal court in New York on Wednesday blocked most of the import taxes from going into effect, ruling that the president had overstepped his authority.

The Court of International Trade ruling is a big setback for Trump , who has sought to reshape global trade and put America first by using its economic heft to cut deals.

Trump has started a global trade war with nearly every country by instituting a minimum 10 per tariff on their exports into the US.

He also slapped a 25 per cent tariff on Mexico and Canada, saying he needed to levies to stop the flow of illegal immigrants and the horror drug Fentanyl.

The court's order could spell an end to

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