India, Feb. 20 -- The US Supreme Court on Friday gave a huge blow to President Donald Trump, striking down his sweeping tariffs that the Republican pursued under a law meant for use in national emergencies.

Thus, the US top court rejected one of Trump's most contentious assertions of his authority in a ruling with major implications for the global economy.

The justices, in a 6-3 ruling authored by conservative Chief Justice John Roberts, upheld a lower court's decision that the Republican president's use of this 1977 law exceeded his authority.

Follow updates on the SCOTUS ruling on Donald Trump's tariffs LIVE here.

Roberts, citing a prior Supreme Court ruling, wrote that "the president must 'point to clear congressional authorisation...