Two top House Republicans were critical of a watchdog report that found the Environmental Protection Agency was innocent of wrongdoing in delaying, if not killing, the Pebble Mine project in Alaska.

The report, issued Wednesday morning, was incomplete by the Office of Inspector General’s own standards. The reason for that was simple: 25 months of missing emails from an EPA ecologist accused of colluding with local tribes to block the mine. Investigators couldn’t fully investigate the assessment without the emails.