The U.S. Food and Drug Administration’s lead drug regulator George Tidmarsh resigned two days after being placed on administrative leave over personal conduct concerns, according to the U.S. Department of Health and Human Services.

Tidmarsh was appointed in late July to be the director for the Center for Drug Evaluation and Research. He didn’t immediately reply to a request for comment from Bloomberg News.

In an interview with the New York Times, Tidmarsh said he was placed on leave after he raised concerns over the legality of a program to speed up approval of some new drugs, which he believed “injected politics into the drug review program.”

The agency placed Tidmarsh on administrative leave on Friday after the Office of the General Counsel and the Office of Inspector General were not

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