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's pick to replace ousted 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 plans to take over oversight of 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, the Department of Justice (DOJ) confirmed Wednesday.

"The Acting Attorney General is in charge of all matters under the purview of the Department of Justice," DOJ spokeswoman Sarah Isgur Flores said in a statement to The Hill.

The move means that Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE will no longer oversee the federal Russia investigation, which he has looked over since Sessions recused himself early last year due to his work on Trump's campaign.

Trump on Wednesday afternoon announced Matthew Whitaker, who served as Sessions's chief of staff at the DOJ, as his temporary replacement atop the department after abruptly ousting Sessions.

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Sessions agreed to resign at Trump’s request, according to a copy of his resignation letter obtained by The Hill.

Trump had long bashed his attorney general over his recusal in the Russia probe. Sessions, who was the first GOP senator to endorse Trump in his 2016 campaign, faced repeated and public attacks from the president during his tenure, including having Trump questioning whether he had an attorney general.

Whitaker has already come under scrutiny by top Democrats, who warn that his previous remarks about Mueller's probe suggest he is unfit to oversee the investigation.

"Given his previous comments advocating defunding and imposing limitations on the Mueller investigation, Mr. Whitaker should recuse himself from its oversight for the duration of his time as acting attorney general," Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) said in a statement on Wednesday.

House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) echoed this call.

Whitaker previously authored an op-ed for CNN that accused Mueller of going "too far."

"The President is absolutely correct. Mueller has come up to a red line in the Russia 2016 election-meddling investigation that he is dangerously close to crossing," Whitaker wrote, calling for Rosenstein to "limit the scope" of Mueller's investigation.

Trump's move to oust Sessions comes one day after the midterm elections, with Democrats regaining a majority in the House.

Democrats have already indicated that they plan to conduct oversight on a series of matters relating to the Trump administration — including his move to oust Sessions on Wednesday.

"Americans must have answers immediately as to the reasoning behind @realDonaldTrump removing Jeff Sessions from @TheJusticeDept. Why is the President making this change and who has authority over Special Counsel Mueller’s investigation? We will be holding people accountable," tweeted Rep. Jerrold Nadler (D-N.Y.), who is the Democrat presumed to become chair of the House Judiciary Committee in the next Congress.