On Wednesday he announced a 25% tariff rate on goods from India, after months of negotiations between Washington and New Delhi failed to produce a trade deal. He also said a 50% tariff on copper pipes and wiring would kick in on Friday.

India and the US have held several rounds of negotiations for a trade deal over the past few months, with Delhi even reducing tariffs on goods like Bourbon whiskey and motorcycles to placate the US. But the US runs a $45bn (£33bn) trade deficit with India, which Trump is keen to reduce.