Hillary Clinton has made a career of stiff-arming Congress, inspectors general and the press. So it looks like it’s up to the courts and law enforcement to get to the bottom of her email scandal.

That’s the real meaning of this week’s news in the email case, as the Clinton stonewall becomes harder to sustain. Mrs. Clinton is turning over to the FBI the private server she used to conduct government business while Secretary of State, as well as three thumb drives containing her government-related email. The Clinton campaign...