William Barr torched his reputation. His testimony compounded the damage.

ATTORNEY GENERAL William P. Barr entered office with more credibility than many Trump appointees. A veteran of the George H.W. Bush administration, Mr. Barr avowed loyalty to the Justice Department’s mission and, nearing the end of his career, seemed to have little incentive to serve as another Trump sycophant. Yet Mr. Barr has lit his reputation on fire, and he just added more fuel during his Wednesday testimony before a Senate panel.