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The US Supreme Court has ruled President Donald Trump's executive order limiting birthright citizenship is unconstitutional.

The BBC's Chief North America Correspondent Gary O'Donoghue explains the attempt to overturn a policy which has been in place for more than a century - and why the court's decision is such a blow to Trump.

Supreme Court's birthright ruling is major blow to Trump. Video, 00:01:29Supreme Court's birthright ruling is major blow to Trump

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