The court has, for years now, deliberately avoided announcing hard-and-fast rules about the scope of injunctions that federal judges can issue. President Donald Trump’s Justice Department wants to change that in a case involving one of his most controversial actions.

As it pushes to implement a plan to end birthright citizenship, the Trump administration is counting on an argument about out-of-control federal judges to prove irresistible to some Supreme Court conservatives.

Judges in Maryland, Massachusetts and Washington have issued nationwide orders blocking President Donald Trump’s executive order to ban birthright citizenship.