India, Feb. 21 -- The United States Supreme Court has delivered one of the most consequential legal setbacks of Donald Trump's second presidential term by striking down his preferred tariff measures.

At the centre of this landmark ruling stood an Indian-origin lawyer whose courtroom arguments proved decisive in dismantling Trump's trade strategy.

That lawyer is Neal Katyal, a former Acting Solicitor General of the United States under Barack Obama, who represented a group of small American businesses challenging the legality of the tariffs.

The judgment from the US Supreme Court ruled that the president does not possess unilateral authority to impose sweeping tariffs without congressional approval.

The decision effectively dismantled a...