President Donald Trump’s pick to lead the Environmental Protection Agency, may have falsely stated under oath that he has not done anything to undermine a pending industrial waste case filed by the state of Oklahoma.

During his Senate confirmation hearing in January, Scott Pruitt, the Republican Oklahoma attorney general and Mr Trump to head the nation's senior environmental agency, defended his actions on a case brought by his Democratic predecessor. The state alleges that several poultry companies in Arkansas dumped thousand of tons waste into the Illinois River, which flows into Oklahoma.

Before Mr Pruitt came into office in 2011, the case received a full federal trial, but the federal judge has yet to issue a ruling.

Mr Pruitt told the Senate in January that he has “done nothing but file briefs in support of the court making a decision.”

The publication Fusion reviewed public records and found that that Mr Pruitt had actually not filed any motions or briefs of this sort. Nearly all the court filings in the six-year period since he started as attorney general have been from lawyers who were withdrawing their representation in the case, Fusion said.

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The publication reported that the only substantive filing by the state since Mr Pruitt took office was a notice that the Supreme Court had issued a ruling in AEP v Connecticut, which was originally thought to be relevant to the lawsuit. The filing said the decision would ultimately not affect the state’s case against the poultry companies.

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A spokesman for Mr Pruitt, John Konkus, told Fusion that Mr Pruitt had been referencing the notice about the Supreme Court decision during the confirmation hearing.