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 went to the White House on Wednesday for a previously planned meeting shortly 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 resigned at 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 request, a Justice Department (DOJ) spokeswoman confirmed to The Hill.

Rosenstein is attending a “preplanned” meeting on a “substantive matter” at the White House, DOJ spokeswoman Sarah Flores said.

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Session’s departure from DOJ had been hinted at for months, with Trump telling Hill.TV in September, “I don’t have an attorney general.” However, the president held off on removing the top law enforcement official from his administration until after Tuesday's midterm elections.

There has also been speculation over whether the president would fire Rosenstein, after The New York Times reported earlier this year that the official had suggested wearing a wire during conversations with Trump and invoking the 25th Amendment to remove the president.

Trump and Rosenstein met after the report, and the high-ranking Justice Department official remained in the position.

Rosenstein was appointed to oversee 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 probe into possible collusion between Russia and the Trump campaign following Sessions's recusal from the investigation — a move which drew the president's ire. However, Flores told The Hill that the new acting attorney general, Matthew Whitaker, is “in charge of all matters under the purview of the Department of Justice."

Democrats have met Whitaker's appointment with calls for him to recuse himself from the Mueller probe.

Whitaker, who has written opinion pieces for The Hill, wrote in an op-ed for CNN last year before he was hired at DOJ that Mueller's probe has "gone too far."

"It is time for Rosenstein, who is the acting attorney general for the purposes of this investigation, to order Mueller to limit the scope of his investigation to the four corners of the order appointing him special counsel," he wrote at the time.

Whitaker also pushed back on the idea of a special counsel in an opinion piece for The Hill in May 2017, after Trump fired former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE.

"Calls for an independent counsel or commission to investigate allegations that Russia tried to interfere with our elections ring hollow when similar calls for special counsels during the scandals of the Obama administration were dismissed out of hand by the same people making these demands now," Whitaker wrote.