The US has launched an investigation into the possible threat to national security posed by imports of titanium sponge — a product that is widely used in the aerospace sector and mostly bought from Japan.
The move was announced by the commerce department on Monday evening and could emerge as a new sore point between Washington and Tokyo as they prepare to enter formal negotiations on a possible trade deal.
The probe into titanium sponge is the fifth of its kind launched by the Trump administration — which has invoked the power to block or limit trade flows into the US based on national security considerations much more frequently than its predecessors.
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