The woman accusing Brett Kavanaugh of a drunken assault when both were teenagers has now come forward publicly, and on Monday it caused Republicans to delay a confirmation vote and schedule another public hearing. Yet there is no way to confirm her story after 36 years, and to let it stop Mr. Kavanaugh’s confirmation would ratify what has all the earmarks of a calculated political ambush.

This is not to say Christine Blasey Ford isn’t sincere in what she remembers. In an interview published in the Washington Post on Sunday,...