New Delhi, June 5 -- The US has doubled its tariff on steel and aluminium imports to 50% from Wednesday, citing a threat to national security. The UK has been spared, thanks to a deal it struck recently with America.

For other exporters, the US market's barrier has just gone up significantly. President Donald Trump sees this as necessary to safeguard American manufacturing jobs.

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But that's a puzzling view. Similar tariffs imposed during his first tenure in 2018 were estimated to have created 1,000 extra jobs in steel, according to anEconomistreport, but at the expense of an astounding 75,000 jobs that were destroyed in sectors using the metal as ...