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Then last week, with little warning, he announced an additional 10% border tax, which has now come into force on Tuesday, along with tariffs on Mexico and Canada.

Trump has already raised tariffs on goods from China, while threatening a range of more sweeping trade actions, including a 25% border tax on goods from Canada and Mexico and new "reciprocal" tariffs set for each country.

Last month, he imposed a new 10% border tax on all imports from China, where Apple has a significant manufacturing presence.

From 10 February, China will charge a 15% border tax on imports of US coal and liquefied natural gas products.

Trump's most unorthodox economic promise was his vow to place tariffs - a border tax - of at least 10% on all goods coming into the US, which would rise to more than 60% for products from China.