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Donald Trump has threatened China with an extra tariff of 50% on goods imported into the US if it does not withdraw a countermeasure it announced on Friday.

China on Thursday urged Trump to immediately lift the new tariffs or face swift countermeasures.

Discussions are currently under way on an even bigger package of countermeasures that are due to come in at the end of April.

China has promised "resolute countermeasures", which are likely to hurt US companies trying to sell into the huge Chinese market.

Beijing's countermeasures will also hurt US companies trying to reach the massive Chinese market.