The Environmental Protection Agency’s (EPA) inspector general said it is investigating 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 use of nonpublic email accounts, the latest in a series of federal investigations into the agency chief.

The inspector general, an independent office within the EPA, will look into whether Pruitt is keeping a record of his emails, as he is mandated to by federal law, and whether the EPA is searching all his accounts when fulfilling public records requests.

According to the EPA, there are three email accounts attributed to Pruitt that are used for administrative tasks.

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“The EPA maintains three email accounts which are attributed to Administrator Pruitt: two are used by staff for calendaring and public correspondence; the third is used by the Administrator. A fourth email account was created for use by the Administrator but was superseded and never used beyond three test emails,” EPA spokesperson Jahan Wilcox said.

Wilcox also noted that, when the EPA receives Freedom of Information Act request, “all accounts are searched before we respond to the FOIA request.”

Members of the Senate Environment and Public Works Committee — ranking member Tom Carper Thomas (Tom) Richard CarperDemocrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (D-Del.) and Sen. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.) — released a letter dated May 2 that confirmed the investigation.

Past EPA administrators also used nonpublic email accounts for everyday communication.

The latest probe comes as Pruitt faces scrutiny over ethical and spending controversies. It also ups the total number of federal investigations into the administrator’s behavior to a dozen.

Past controversies with Pruitt involved his high-cost travel, use of security personnel, and a $50-a-night condo he rented from the wife of an energy lobbyist whom he later met with.

In a letter responding to Merkley, EPA Inspector General Arthur Elkins said he does not know yet when the investigation into Pruitt’s email accounts would begin because of funding restraints.

This story was updated on May 16 at 10:40 a.m.