A Strategic Roadmap for House Republican Investigations

House Republicans have a golden opportunity to shine some real sunlight on executive-branch abuses, if they deploy their investigative powers with care.

When voters give unified control of the federal government to one party, it is an act of faith, but the leash is often a short one. When they redivide government by turning over just one chamber of Congress, the chief mandates of the opposition are to restrain the party in power from excess and to hold it accountable.

In our system of checks and balances, congressional oversight of the...