Trump formally nominates Jeffrey Rosen to replace Rosenstein at DOJ

President TrumpDonald John Trump2020 Democrats spar over socialism ahead of first debate Senate passes .5 billion border bill, setting up fight with House 'Teflon Don' avoids the scorn of the 'family values' GOP — again MORE on Tuesday officially nominated Transportation official Jeffrey Rosen to serve as deputy attorney general at the Department of Justice upon Rod RosensteinRod RosensteinMueller to testify publicly on July 17 Trump: Appointing Sessions was my biggest mistake Trump blasts Mueller, decries 'witch hunt' at 2020 launch 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 MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump MORE has wrapped up his investigation into Russian interference in the 2016 election.

Attorney General William BarrWilliam Pelham BarrThe Hill's 12:30 Report: Anticipation high ahead of first debate Attorney General Barr plays bagpipes at conference The Hill's Morning Report - Democratic debates: Miami nice or spice? 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 SessionsAttorney General Barr plays bagpipes at conference Roy Moore trails Republican field in Alabama Trump: Appointing Sessions was my biggest mistake 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 McCabeMcCabe says it's 'absolutely' time to launch impeachment inquiry into Trump Feds gone wild: DOJ's stunning inability to prosecute its own bad actors Comey: Trump peddling 'dumb lies' 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."