Deputy Attorney General Rod Rosenstein will leave the Department of Justice by the middle of March, according to a new report.
It was Rosenstein who, following the firing of FBI Director James Comey in May 2017, appointed Robert Mueller as special counsel to investigate allegations that Trump officials had conspired with Russian Federation to propel the real-estate mogul to victory in the 2016 presidential election.
McCabe alleged that Rosenstein raised the idea of the 25th Amendment against President Donald Trump and even talked about going into the White House wearing a wire.
Mr Barr's appointment was confirmed by the Senate last week.
Rosenstein and the Justice Department have denied those allegations, but that didn't stop Trump from taking a shot at Rosenstein, whom Trump nominated in 2017, and McCabe on Twitter.
Deputy Attorney General Rod Rosenstein speaks at a news conference about Chinese hacking at the Justice Department in Washington, D.C., on December 20, 2018.
CNN said Rosenstein has widely been expected to leave his job after Bill Barr is confirmed to fill the vacant post of attorney general.
But after Mr Sessions was ousted in November, his replacement Matthew Whitaker took over the investigation, refusing to recuse himself despite his previous public criticism of the probe.
Earlier on Monday Trump accused both McCabe and Rosenstein of planning a "very illegal act", which he described in a tweet as "illegal and treasonous".
The Justice Department has said McCabe's characterization of his conversations with Rosenstein are inaccurate. The network cited a senior DOJ official in its report.
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