The14th Amendment was intended to correct the moral wrongs of slavery. But it has been misunderstood and reinterpreted in cases involving workdays, schools, train cars and birth control.

In the few days since he returned to the White House, President Donald Trump’s sweeping executive orders and mass pardons have shattered political and legal norms. But one order is in a category of its own.

Eighteen states have sued the federal government over the executive order, showing the legal challenges the president will face.