With Attorney General Alberto Gonzales testifying before the Senate Judiciary Committee today, the Op-Ed page asked four legal experts to step into a senator’s shoes and list three questions they would ask Mr. Gonzales.

• A Little Discretion, By David C. Iglesias

• Congress’s Role, By Steven G. Calabresi

• Voter Suppression and Rising Crime, By Ron Klain

• Loyalty First? By Jeffrey Rosen