President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE lashed out on Monday at the Justice Department on Twitter, accusing the department and the FBI of “slow walking” documents requested by lawmakers to Congress.

“So sad that the Department of ‘Justice’ and the FBI are slow walking, or even not giving, the unredacted documents requested by Congress,” Trump tweeted. “An embarrassment to our country!”

So sad that the Department of “Justice” and the FBI are slow walking, or even not giving, the unredacted documents requested by Congress. An embarrassment to our country! — Donald J. Trump (@realDonaldTrump) April 2, 2018

Conservative lawmakers in the House have subpoenaed the Justice Department for documents in the course of an investigation into what Republicans say is potential abuse and criminality at the department during the 2016 presidential race.

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Democrats have described the probe, led by House Judiciary Committee Chairman Bob Goodlatte Robert (Bob) William GoodlatteNo documents? Hoping for legalization? Be wary of Joe Biden Press: Trump's final presidential pardon: himself USCIS chief Cuccinelli blames Paul Ryan for immigration inaction MORE (R-Va.) and House Oversight and Government Reform Committee Chairman 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 (R-S.C.), as a partisan distraction aimed at muddying the waters around 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 into President Trump's campaign and Russia.

Specifically, GOP lawmakers want to see a tranche of more than a million documents examined by Justice Department Inspector General Michael Horowitz, who is conducting a parallel probe into decision-making during the 2016 race.

FBI Director Christopher Wray recently announced the bureau was doubling the number of personnel working to respond to the document requests, to 54 staffers working in two shifts from 8 a.m. to midnight. Lawmakers have received about 3,000 documents so far.

The tweet, sent out the morning after Easter, is the latest salvo in Trump’s ongoing criticism of the Department of Justice. He has previously tweeted that the reputation of the FBI is “in tatters.”

It comes just days after Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE informed lawmakers that, for now, he will not be ceding to Republican demands for a second special counsel to investigate a swath of allegations related to the department's conduct during the presidential race.

Trump's attacks on the Justice Department have made even some Republican lawmakers on Capitol Hill uncomfortable. Gowdy called the president's rhetoric “not helpful" in a recent interview with The Hill.

But Republicans believe there is evidence that bias crept into decisions made in both the investigation into former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s use of a private email server and the counterintelligence probe into possible ties between the Trump campaign and Russia.

They point to a series of text messages between two FBI employees who worked in some capacity on both probes as evidence of anti-Trump bias within the department. The messages were critical of Trump and other political figures during the campaign.

House conservatives celebrated the recommendation by an internal FBI department that handles personnel matters that Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE, a longtime GOP target, be dismissed for allegedly misleading investigators.

And lawmakers have also raised alarm bells about allegations of surveillance abuse raised by a controversial memo authored by staff for House Intelligence Committee Chairman Devin Nunes Devin Gerald NunesSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Sunday shows preview: With less than two months to go, race for the White House heats up Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-Calif.).

“What would be most helpful would be say is, it is the world’s premier law enforcement agency, it’s had a rough 18 months, [but] we’re gonna get to the bottom factually,” Gowdy said.

Horowitz is expected to issue a report on his investigation into the matter this month.