Washington ? A high-ranking Interior Department official tainted nearly every decision made on the protection of endangered species over five years, a new inspector general report finds, concluding she exerted improper political interference on many more rulings than previously thought.

Julie MacDonald, a former deputy assistant secretary overseeing the Fish and Wildlife Service, did pervasive harm to the department’s morale and integrity and may have risked the well-being of species with her agenda, Interior Inspector General Earl Devaney said in his report out Monday.

The Interior Department last year reversed seven rulings that denied endangered species increased protection, after an investigation found that MacDonald had applied political pressure in those cases. The new report looked at nearly two dozen other endangered species decisions not examined in the earlier report. It found MacDonald directly interfered with at least 13 decisions and indirectly affected at least two more.

MacDonald, a civil engineer with no formal training in natural sciences, resigned in May 2007.