US trading partners say the new levies on drugs and other products are "unfair" and "unjustified". Photo: AP PHOTO

US President Donald Trump has unveiled a fresh round of punishing tariffs on a broad range of imported goods, including 100 per cent duties on branded drugs and 25 per cent levies on heavy-duty trucks.

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The latest salvo, which Trump said was to protect the US manufacturing industry and national security, follows sweeping duties on trading partners of up to 50 per cent and other targeted levies on imported products such as steel.

The barrage has cast a pall over global g

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