President Donald Trump’s administration is asking the Supreme Court to uphold his birthright citizenship order declaring that children born to parents who are in the United States illegally or temporarily are not American citizens.

The Justice Department’s petition has been shared with lawyers challenging the order, but is not yet docketed at the Supreme Court. “The lower court’s decisions invalidated a policy of prime importance to the president and his administration in a manner that undermines our border security,” Solicitor General John Sauer wrote, “Those decisions confer, without lawful justification, the privilege of American citizenship on hundreds of thousands of unqualified people.”