Environmental Protection Agency (EPA) Administrator Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE’s top Superfund adviser is leaving the agency amid increasing scrutiny.

Kelly resigned Tuesday, EPA confirmed.

Albert Kelly was hired to lead the Superfund program last year but has been under fire almost from the start for his lack of a scientific background and his own financial history.

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It was first reported last December that Kelly was banned from working in the banking sector for life. Pruitt hired Kelly last year as an adviser for the Superfund program, shortly before the Federal Deposit Insurance Corp. (FDIC) settled unknown allegations against Kelly by banning him from banking.

Kelly used to lead SpiritBank, based in Pruitt’s hometown of Tulsa, Okla. The two have known each other for years, and Kelly got Pruitt financing for a mortgage and to help buy a minor league baseball team.

Lawmakers have increasingly pushed against Kelly's appointment at the agency. Members pressed Pruitt in front of House committee hearing last week for Kelly to appear before them to answer questions about his banking past. Rep. Scott Peters Scott H. PetersModerate Democrats push leadership to pull marijuana legislation One doctor's thoughts on a hopeful future Pelosi axes idea of Saturday vote on additional COVID relief MORE (D-Calif.) asked Pruitt if he would produce Kelly in front of the House Appropriations subcommittee on environment for the point of "transparency.

Pruitt responded: "I’m not standing in the way of Mr. Kelly of providing information in front of this committee or any other committee. It's a decision he can make."

Earlier in the week two House Democrats — Reps. Don Beyer (Va.) and Gerry Connolly Gerald (Gerry) Edward ConnollyJudge issues nationwide injunction against Postal Service changes House panel advances bill to ban Postal Service leaders from holding political positions Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (Va.) — sent a letter to the EPA internal watchdog asking for an investigation into Kelly.

"Mr. Kelly came to this position without the necessary qualifications, and with serious and still-unexplained red flags, and his conduct has raised ethical, regulatory and potential legal issues that we believe your office should examine,” the lawmakers wrote.

Kelly has worked to downplay the banking ban, telling the Montana Standard in early April that the FDIC ban was related to a 2010 transaction and had nothing to do with his business dealings with Pruitt.

“My problem with the FDIC emanated from one singular transaction in 2010. They didn't like it,” Kelly told the Standard. “The bank didn't lose any money. The bank made money. There was nothing untoward about it."

Pruitt, who has made cleaning up Superfunds a top priority, said that Kelly had a "tremendous impact" on the program.

“Kell Kelly’s service at EPA will be sorely missed. In just over a year he has made a tremendous impact on EPA’s Superfund program, serving as chair of the Superfund Task Force and presiding over the development of the steps necessary to implement the recommendations in the report," Pruitt said in a statement. "While Kell’s departure is one that will be felt across the Agency, a strong staff of dedicated professionals will continue this valuable work."

Pruitt said Peter Wright, the nominee for associate administrator in the Office of Land and Emergency Management, will work to fill his shoes.

Pruitt himself has been at the center of several scandals related to his personal spending at the agency, particularly on first-class travel and a large security team.

Kelly’s departure comes a day after Pruitt's head of security resigned and just weeks after Samantha Dravis, another top aide, abruptly left the agency.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE has continued to defend Pruitt amid the controversies. White House Legislative Director Marc Short said last month Trump has full confidence in the administrator.

This story was updated 11:51 a.m.