Attorney General under fire

William Barr said tweets by President Donald Trump make it "impossible for me to do my job."
3:26 | 02/15/20

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Transcript for Attorney General under fire
or two. Thank you. And the justice department opening a new probe into the handling of the Michael Flynn case. It comes amid criticism the president applied pressure on the justice department in the Roger stone case. The attorney general denying that in our ABC news interview. Here's Terry Moran. Reporter: Attorney general bill Barr, already accused of doing a favor for the president with Roger stone. Tonight, we've learned he's ordered the review in the case of Michael Flynn. I feel badly for general Reporter: The news comes just a day after the attorney general in an extraordinary rebuke told the president -- It's time to stop the tweeting about department about justice criminal cases. Reporter: Trump was back on Twitter, insisting that while he's never directly intervened in a case, "This doesn't mean that I do not have, as president, the legal right to do so. I do, but I have so far chosen not to." So far. In his interview with ABC news, attorney general bill Barr warned that trump's railing about specific cases, saying who should or should not be investigated and prosecuted is undermining Barr's credibility and the rule of law. To have public statements and tweets made about the department, about our people in the department, our men and women here, about cases pending in the department, and about judges before whom we have cases, make it impossible for me to do my job. Reporter: One frequent trump target, former FBI deputy director Andrew Mccabe, under investigation for two years for allegedly lying to investigators about a leak to the media. Trump tweeting that Mccabe was part of an "Illegal and treasonous" plot. Ripping into him again and again while he was being investigated. I think he's a disaster, and what he was trying to do was terrible. Reporter: Today the prosecutors in the case announced Mccabe will not face any charges. And Mccabe fired back. It's an absolute disgrace that they took two years and put my family through this experience for two years before they finally drew the obvious conclusion, and one they could have drawn a long, long time ago. Reporter: A federal judge in the case was troubled, too. Court transcripts released today show him comparing the investigation of Mccabe to something that happens in "A banana republic," and saying, "I don't think people like the fact that you got somebody at the top basically trying to dictate whether somebody shoulbe prosecuted." Let's get to Terry, live at the white house. We know the president has had a lot to say about the Mccabe case and the prosecution of Michael Flynn. And the attorney general's decision to review that case is raising new questions of improper influence? Reporter: Inevitably. Michael Flynn pleaded guilty to lying to investigators. He's tried to reverse that plea, but that went nowhere. And now the attorney general saying new prosecutors will step in. Trump and Barr both say they don't talk about these cases. They insist there's no undue influence, but they see the cases the same way, and it den fits the president. Terry, thank you. New to what could be a new deal in Afghanistan tonight.

This transcript has been automatically generated and may not be 100% accurate.

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