President Donald Trump has appealed a recent court decision that invalidated his administration's use of tariffs, escalating global trade uncertainty and potentially impacting billions in refunds.

US President Donald Trump filed an appeal on Friday after the latest legal setback to his signature tariff policy, piling on more chaos and global uncertainty and setting up a new tussle over billions of US dollars in refunds. The appeal follows a decision on Thursday by the US Court of International Trade that invalidated his use of a Section 122 trade provision that saw him slap 10 per cent import taxes on nearly every country on earth. In its ruling, the court found that he failed to meet the...