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 on Tuesday officially nominated Transportation official Jeffrey Rosen to serve as deputy attorney general at the Department of Justice upon 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's departure.

Rosen currently serves as deputy secretary of Transportation, and will require Senate confirmation for his new role. He previously served in the George W. Bush administration and practiced law at the Kirkland & Ellis law firm.

Trump's choice of Rosen was first reported last month, but the president officially sent the nomination to the Senate on Tuesday.

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Rosenstein was previously expected to leave his role in mid-March, but a senior DOJ official told NBC News last week that he would remain on "a little longer."

His exit could be imminent now that 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 has wrapped up his investigation into Russian interference in the 2016 election.

Attorney General William Barr Bill BarrProsecutor says no charges in Michigan toilet voting display Judge rules Snowden to give up millions from book, speeches The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE issued a four-page summary on Sunday of Mueller's main findings, writing that the special counsel's investigation did not find that there was collusion between the Trump campaign and the Russian government. On the matter of alleged obstruction of justice, Mueller said he had neither exonerated Trump nor concluded that he had committed a crime, according to Barr's summary.

Rosenstein oversaw the special counsel's investigation after former 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 recused himself, but turned over control of the probe to Barr upon his confirmation earlier this year.

Rosenstein came under scrutiny in recent months following a report that he'd been part of discussions about invoking the 25th Amendment to remove Trump from office.

The president seized on the allegations, detailed by former FBI 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, to suggest the two men looked "like they were planning a very illegal act, and got caught."

The Justice Department issued a statement calling McCabe's account of events "inaccurate and factually incorrect."

McCabe also walked back his remarks, with a spokeswoman issuing a statement that he did not "participate in any extended discussions about the use of the 25th Amendment, nor is he aware of any such discussions."