A top Environmental Protection Agency (EPA) political appointee is under investigation for his suspected involvement in the destruction of important documents that should have been retained, Politico reported late Thursday.

The investigation by EPA’s Office of the Inspector General (OIG) focuses on Ryan Jackson, the chief of staff to agency head Andrew Wheeler Andrew WheelerOvernight Energy: Trump officials finalize plan to open up protected areas of Tongass to logging | Feds say offshore testing for oil can proceed despite drilling moratorium | Dems question EPA's postponement of inequality training Democrats question EPA postponement of environmental inequality training OVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right MORE.

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The investigation renews interest in claims that Pruitt was keeping a “secret calendar” in order to hide meetings with executives from industries regulated by the EPA.

A National Archives and Records Administration (NARA) investigation found those claims to be unsubstantiated, but EPA’s OIG has continued the probe.

A source told Politico that Jackson was repeatedly put on notice that he was improperly handling documents.

“They would scold us on a daily basis and Ryan would say, ‘Oh, I didn’t know, we’ll do better next time,’" a former official told the publication.

The EPA pushed back on Friday.

“Even the National Archives have publicly stated these claims are ‘unsubstantiated.’ Politico choosing to run this story on the baseless claims of one disgruntled former employee does not make it true. EPA takes record retention seriously and trains all employees (career and political) on proper protocols and will continue to follow them,” spokesman Michael Abboud wrote in an email to The Hill.

Abboud also pointed to a letter from NARA focused on the calendar review, which found “no evidence that staff members deleted meetings that actually occurred from the official calendar.”

It is not clear whether the OIG probe is limited to destroying documents related to Pruitt’s calendar.

News of the investigation comes as Jackson’s stonewalling of OIG investigators in at least one other investigation has prompted a public battle between the agency and its internal watchdog.

OIG sent a “Seven Day Letter” to Congress and the EPA this week detailing its struggles in getting Jackson to cooperate.

That battle spilled into Friday when the OIG released another letter critiquing an EPA legal opinion the agency relied on which argued the agency had done enough to accommodate investigators.

An OIG spokesperson would not comment on the nature of the ongoing investigations that spurred the Seven Day Letter.

“Because it is ongoing, we’re not able to identify the topic or any details of the investigation,” the office told The Hill.

Officials found guilty of unlawfully handling documents can be fined and face up to three years in jail.