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Senator John Barrasso, a Republican from Wyoming and Chairman of the Senate Environment and Public Works Committee, speaks during a confirmation hearing for Oklahoma Attorney General Scott Pruitt, administrator of the Environmental Protection Agency (EPA) nominee for U.S. President-elect Donald Trump, not pictured, in Washington, D.C., U.S., on Wednesday, Jan. 18, 2017. Pruitt outlined a vision for scaling back the office's reach, while pledging to support clean air and water and hold polluters responsible for violations when necessary. Photographer: T.J. Kirkpatrick/Bloomberg via Getty Images

Senator John Barrasso, a Republican from Wyoming and Chairman of the Senate Environment and Public Works Committee,  speaks during a confirmation hearing for Oklahoma Attorney General Scott Pruitt, administrator of the Environmental Protection Agency (EPA) nominee for U.S. President-elect Donald Trump, not pictured, in Washington, D.C., U.S., on Wednesday, Jan. 18, 2017. Pruitt outlined a vision for scaling back the office's reach, while pledging to support clean air and water and hold polluters responsible for violations when necessary. Photographer: T.J. Kirkpatrick/Bloomberg via Getty Images