Two Democratic senators requested Tuesday that the Environmental Protection Agency's (EPA) Office of Inspector General investigate reports that 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 uses multiple email accounts to conduct business.

Sen. 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.), the ranking member of the Environment and Public Works Committee, 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.), who also sits on the committee, asked for an investigation into Pruitt's use of three epa.gov email addresses in addition to his public government-issued address, warning that their use may not be in compliance with the Federal Records Act.

"Since early 2017, the EPA has received thousands of Freedom of Information Act (FOIA) requests from the public asking for email records, including those from Administrator Pruitt. With the use of multiple secret email accounts or addresses, we are concerned that the Office of the Administrator may be withholding information from the public in violation of valid FOIA requests," their letter reads.

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The two said they first learned of Pruitt's use of multiple email accounts at the agency in December, when they were told there were three email addresses. Since then, they said they have been informed that he uses "at least four."

The four known email addresses for Pruitt are pruitt.scott@epa.gov, esp7@epa.gov, adm14pruitt@epa.gov and sooners7@epa.gov, The Washington Post reported Thursday.

The agency later confirmed to The Hill the existence of three email accounts belonging to Pruitt, but said a fourth one that was created was no longer in use.

“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. When we receive a FOIA request all accounts are searched before we respond to the FOIA request," said EPA spokesperson Jahan Wilcox in a statement.

The EPA is facing a record number of FOIA requests under the Trump administration, which has in part led to an extreme backlog in response rates. Between Jan. 20, 2017, and the end of last year, 11,431 FOIA requests were filed to the EPA — an increase of about 17 percent compared to the same time period in former President Obama’s last year in office, a Project on Government Oversight report found.

The letter to the Inspector General was the first in a string of letters sent this week regarding Pruitt's practices.

A group of Democratic senators and House members, including Carper, sent a letter Thursday to both 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 and Pruitt requesting additional details surrounding Pruitt's expenses. The letter came after they interviewed a former EPA aid who was reportedly removed from his position for questioning Pruitt's spending.

Updated: 2:37 p.m.