CHICAGO (CBS) — The man who oversaw the Illinois unemployment system during the height of the pandemic, and was widely criticized for the agency’s response, has resigned. In his resignation letter he said he was taking a position at the U.S. Department of Labor.

Tom Chan was acting director of the Illinois Department of Unemployment Security until a permanent replacement was named last month.

He has now left IDES altogether.

The leadership change came as the CBS 2 Investigators revealed Chan had been the subject of multiple internal complaints.

But IDES so far has released few details about those complaints, and as refused to provide documents in response to our public records request.