US president speaks after saying that any country that does business with Iran will face 25% levy on trade with US

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Donald Trump has said “it would be a complete mess” if the US supreme court were to strike down his global trade tariffs.

In a lengthy post on social media, the US president said “WE’RE SCREWED” if the supreme court rules against the tariffs, before the decision, which could come as soon as Wednesday. It is a crucial legal test of his controversial economic strategy and his power.