New Jersey Gov. Chris Christie has given two different timelines of when he learned of lane closures on the George Washington Bridge after they were imposed by his aides, allegedly for political reasons. Local lanes of the bridge connecting New York City to New Jersey were diverted for five days in September, ostensibly for a traffic study. It later emerged that Christie allies had engineered the closures, which caused massive traffic jams in Fort Lee, N.J., whose mayor didn't endorse Mr. Christie. The governor said he had no knowledge of his allies' involvement in the closures.