Environmental Protection Agency
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Patrick Sullivan, Assistant Inspector General for Investigations, Office of Inspector General, EPA, testifies before the House Oversight and Government Reform full committee hearing, Wednesday, May 7, 2014 in Washington. A turf battle between the Environmental Protection Agency's inspector general and an EPA unit run by President Barack Obama's political staff gets an airing before Congress. (AP Photo/Molly Riley)

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Bob Perciasepe, Deputy Administrator, EPA, testifies before the House Oversight and Government Reform full committee hearing, Wednesday, May 7, 2014 in Washington. A turf battle between the Environmental Protection Agency's inspector general and an EPA unit run by President Barack Obama's political staff gets an airing before Congress. (AP Photo/Molly Riley)

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Gina McCarthy (Associated Press)

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A presentation prepared in 2010 for then-EPA Administrator Lisa P. Jackson made clear that a pre-emptive veto "had never been done before in the history" of the Clean Water Act and could risk litigation. (Associated Press)