Trump formally nominates Jeffrey Rosen to replace Rosenstein at DOJ

President TrumpDonald John TrumpGOP congressman slams Trump over report that U.S. bombed former anti-ISIS coalition headquarters US to restore 'targeted assistance' to Central American countries after migration deal Trump says lawmakers should censure Schiff MORE on Tuesday officially nominated Transportation official Jeffrey Rosen to serve as deputy attorney general at the Department of Justice upon Rod RosensteinRod RosensteinTrump attacks Sessions: A 'total disaster' and 'an embarrassment to the great state of Alabama' Mueller rejoins DC law firm Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it 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 MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network MORE has wrapped up his investigation into Russian interference in the 2016 election.

Attorney General William BarrWilliam Pelham BarrMatthew Shepard's parents blast Barr's LGBTQ record in anniversary of hate crime law Trump denies knowledge of Barr meeting in Italy, says it would be appropriate Mulvaney helped organize controversial Ukraine meeting 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 SessionsJefferson (Jeff) Beauregard SessionsTrump attacks Sessions: A 'total disaster' and 'an embarrassment to the great state of Alabama' Ocasio-Cortez fires back at Washington Times after story on her 'high-dollar hairdo' Trump's tirades, taunts and threats are damaging our democracy 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 McCabeAndrew George McCabeBrendan Gleeson lands Trump role in CBS miniseries based on Comey memoir Judge tells DOJ to charge McCabe or drop investigation McCabe says he would 'absolutely not' cut a deal with prosecutors 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."