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Europe has warned that trade deals struck with the U.S. could now be at risk after President Donald Trump unveiled a new global 15% tariff on all imports at the weekend.

Trump’s move came after the U.S. Supreme Court on Friday struck down his global tariffs policy, implemented last spring, that had upset the long-standing global trading order.

The president reacted to the Supreme Court’s judgment by initially announcing a new universal 10% levy, using a different legal framework for the latest tariffs, but then increased the global tariff rate to 15% — the legal maximum which can be in place for 150 days before Congressional approval is required.

The new import duties are “effective immediately,” Trump said in a Truth Social post on Saturday.