New Delhi, May 13 -- The US Supreme Court is reviewing one of Donald Trump's most controversial policies - restricting birthright citizenship - but it may avoid ruling directly on whether the policy is legal. Instead, the justices are being asked to decide whether lower court judges had the power to block the policy nationwide.

Trump's January executive order denies automatic US citizenship to children born on American soil unless one parent is a US citizen or permanent resident. This has sparked lawsuits from 22 Democratic-led states and civil rights groups, who argue the order violates the 14th Amendment of the Constitution, which grants citizenship to nearly everyone born in the US.

The Trump administration isn't asking the court to ...