Many science advocates and environmentalists voiced concerns about Pruitt's nomination. Gene Karpinski, the president of the League of Conservation Voters said that Pruitt's past actions as Oklahoma AG made the nomination "like the fox guarding the henhouse ... Time and again, he has fought to pad the profits of Big Polluters at the expense of public health." Ken Kimmell, president of the Union of Concerned Scientists, has said, "Pruitt's record gives us no reason to believe that he will vigorously hold polluters accountable or enforce the law ... everything we do know makes it clear that he can't and won't do the job." Saying that Pruitt had deliberately given misleading information about his position on the regulation of mercury emissions, a spokesperson from the Natural Resources Defense Council said, "It is a serious matter to give misleading testimony to Senators during a confirmation hearing." 447 former EPA employees penned a joint letter to oppose Pruitt's nomination, arguing that his lawsuits against the EPA "strongly suggest that he does not share the vision or agree with the underlying principles of our environmental laws" and that they believed that he had not "put the public's welfare ahead of private interests".