Aside from a couple of brief allusions, Donald Trump and Hillary Clinton have skimmed over immigration reform in the presidential debates so far. Mr. Trump hasn’t mentioned his Great Wall of the Rio Grande. Hillary hasn’t repeated her earlier promises to defy Congress if need be and grant unilateral amnesty to large numbers of illegals. We’ll see what surprises tonight’s debate brings.

The omissions, though, have not been unwelcome. The position of neither candidate reflects a thought-out approach to this rankling issue. Anyone...