The Oklahoma Bar Association is investigating an ethics complaint alleging that Environmental Protection Agency (EPA) Administrator Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE misled a Senate committee about his use of a private email address during his tenure as Oklahoma's attorney general.

The complaint was filed last week by the Center for Biological Diversity and University of Oklahoma law professor Kristen Van de Biezenbos. In it, they allege that Pruitt incorrectly told members of the Senate Environment and Public Works Committee that he never used a private email to conduct official business as Oklahoma's top law enforcement official.

The investigation was first reported by KSWO-TV in Oklahoma.

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A public records lawsuit, however, found several instances in which Pruitt did, in fact, use a private email address for official business.

"It appears that Mr. Pruitt misrepresented material facts that bore on the Senate committee’s analysis of Mr. Pruitt’s fitness to serve as EPA Administrator," the complaint reads.

By misrepresenting the facts, it said, Pruitt violated Oklahoma's rules of professional conduct.

Pruitt was confirmed by the Senate last month, though his nomination to the top EPA job was a subject of controversy for Democrats and environmental advocates, who pointed to Pruitt's antagonistic relationship with the environmental agency. During his tenure as Oklahoma attorney general, Pruitt sued the EPA more than a dozen times.