Wagner has close personal and business ties to Scott Pruitt, who ran the EPA until he was forced out in July.

After months of ethics scandals and investigations, the embattled Environmental Protection Agency head has resigned, the president said Thursday.

Environmental groups plan to challenge the decision in court.

EPA Administrator and former Oklahoma Attorney General Scott Pruitt was back in the Sooner State last week — to talk about what his agency plans to do about saltwater contamination in Bird Creek in Osage County that could be tied to the oil and gas industry.