The head of the House Oversight and Reform Committee is expanding its investigation into whether White House officials used personal email accounts to conduct official business, while also blasting the Trump administration for failing to provide a single requested record so far.

Committee Chairman Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.) in a letter on Monday asked the White House to turn over copies of all emails and other communications in which administration officials may have violated federal law as well as the White House’s records policy.

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"I am writing to inform you that, due to your complete refusal to produce a single document in response to the Committee’s investigation of the use of personal email and messaging accounts by White House officials, the Committee is now expanding its request to seek copies of all communications sent or received in violation of federal law and the White House’s own records policy," the letter reads.

The expansion comes amid what Cummings described as blatant stonewalling by the administration as the committee seeks to conduct its oversight probe.

In December, Cummings asked for records on President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's top advisers, including Ivanka Trump Ivana (Ivanka) Marie TrumpThe Hill's 12:30 Report: Trump stokes fears over November election outcome Special counsel investigating DeVos for potential Hatch Act violation: report Trump, Biden vie for Minnesota MORE and Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE as well as any other non-career officials.

Now Cummings says he wants that previously requested information as well as "all presidential records sent or received by non-career officials at the White House using non-official electronic messaging accounts,” all documents related to allegations or evidence of misuse and all communications in which White House employees discussed the possibility of non-career officials sending messages that could've included classified information from their personal email accounts.

Under the Presidential Records Act, White House employees are not allowed to create or send a record “using a non-official electronic message account." If they do, they must forward complete copies of such communications to their official account.

A GOP spokesperson for Oversight described Cummings' latest letter as "yet another example of Democrats’ obsession with finding some rationale to impeach the President.”

“The Presidential Records Act was not intended to create a fishing license for Chairman Cummings to pry into the private communications of the first family," the spokesperson said in a statement.

Cummings noted that in the time since he sent his initial requests, the committee has received further evidence of such violations, including from former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation.

Trump's former adviser Stephen Bannon told Mueller that he “regularly used his personal Blackberry and personal email for work-related combinations (including those with [Erik] Prince), and he took no steps to preserve them," according to the report.

The chairman noted that some of these information requests were made by the panel's former Republican chairmen, including former Reps. Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (Utah) and Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (S.C.).

And while he notes White House lawyers have provided brief replies, Cummings called their responses "deficient."

"Unfortunately, over the past six months since I sent my letter, you have not produced a single document, you have not provided any of the requested briefings, and you have not offered any timeline by which these requests will be fulfilled," Cummings wrote in a statement.

"The White House’s complete obstruction of the Committee’s investigation for the past six months is an affront to our constitutional system of government," his statement concludes.