All three major US benchmarks tumbled after President Donald Trump said he was considering a “massive” increase in tariffs on Chinese goods entering the US in response to China’s throttling of rare-earth minerals exports.

Roughly an hour after the end of trading, Trump said he will impose a 100 per cent tariff on Chinese goods, “over and above” any current tariff, as well as export controls on “any and all” critical software sold to China as of November 1.

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