During a press gaggle aboard Air Force One on Tuesday, White House deputy press secretary Hogan Gidley called the numerous reports about Pruitt "troublesome" and said the President was concerned about them.
The EPA's Office of Inspector General, the U.S. Office of Special Counsel and the House Oversight and Government Reform Committee are among the investigators.
"However, the unrelenting attacks on me personally, my family, are unprecedented and have taken a sizable toll on all of us".
Pruitt has for months faced increasing pressure to resign amid a laundry list of reports into his ethically questionable leadership at the agency.
Pruitt left after the encounter but according to his spokesman, that was not the reason.
But revelations about his behavior continued to mount, including reports that he repeatedly enlisted subordinates to help him search for housing, book personal travel and even help search for a six-figure job for his wife. "Pruitt has done a good job at deregulating the economy".
CREDO Action's statement came just moments after Trump announced Thursday that Pruitt had resigned.
Wheeler is expected to serve in an acting capacity as head of the EPA until Trump nominates a new agency chief, who must then be confirmed by the Senate.
"We deserve to have somebody at the EPA who actually does protect our environment, someone who believes in climate change and takes it seriously, for the benefit of all of us, including our children", Mink was recorded saying on a video she shared on Facebook.
Now, Pruitt has already been accused of trying to land his wife a Chick-fil-A franchise of her own.
As far back as January, sources with knowledge of the matter said Pruitt, a conservative former attorney general of Oklahoma, was interested in replacing Sessions.
Trump is apparently aware of the turmoil surrounding Pruitt, but has remained publicly supportive of him.
Pruitt has made it his mission to slash environmental regulations since taking over the EPA. Pruitt faces more than a dozen federal inquiries into his spending and management practices as EPA administrator, according to the Times.
Earlier in April, the independent Government Accountability Office said Pruitt's agency broke the law when it spent $43,000 on a soundproof phone booth without first notifying Congress. He made swamp creatures blush with his shameless excesses.
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