DOJ inspector general grilled over Russia report

Michael Horowitz faced tough questioning from lawmakers on both sides of the Senate Judiciary Committee about his nearly 500-page report examining the origins of the Russia investigation.
3:42 | 12/12/19

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Transcript for DOJ inspector general grilled over Russia report
And now to the battle on capitol hill tonight over the report on the Russia investigation that determined no deep state, no spying on the trump campaign. The author of that report, the inspector general, Michael Horowitz, saying the launch of the Russia investigation was, in fact, justified. But he did acknowledge today that his report does not vindicate anyone. Here's ABC's chief justice correspondent Pierre Thomas now. Reporter: On capitol hill today, the justice department's inspector general Michael Horowitz dending his conclusion that the FBI was justified in launching its investigation into Russia and the trump campaign. We did not find documentary or testimonial evidence that indicated political bias or improper motivation. Reporter: That conclusion now under attack from the attorney general William Barr himself. Barr also insisting the FBI may have acted in bad faith. Did you show this report to attorney general Barr before it was released? Yeah, as standard process, we provide this to the attorney general and to the FBI director. Did he suggest any changes? He didn't suggest any changes. Did attorney general Barr provide any evidence that caused you to alter this key finding that the FBI investigation had an adequate predicate? No, we stand by our finding. Reporter: President trump tweeting from the white house, "They spied on my campaign!" And you didn't find a deep state conspiracy against candidate or president trump. As to the opening, we found no bias, no testimonial evidence on that. Reporter: But Horowitz did have tough words for the FBI, saying they made basic, fundamental and serious errors" in this investigation. Withholding evidence that could have weakened their case. You know, I think the activities were found here don't vindicate anybody who touched this. Reporter: He cited one FBI attorney who altered documents in order to get a surveillance warrant for trump campaign associate Carter page. Is it kind of off the charts bad? It's pretty bad. So, let's get back Pierre Thomas, with us tonight. And Pierre, we know attorney general bill Barr not willing to accept the finding that bias was not at the root of this FBI investigation that was launched, but today, the inspector general stood firm on that point. Reporter: Horowitz was quite firm, David, saying over and over again that he stands by everything in his report and he said he did not take the job to be popular, David. Pierre Thomas with us tonight, as well. Thank you, Pierre. Zble we turn now to impeachment. The house judiciary committee tonight launching their final debate on articles of impeachment against predent trump. In fact, lawmakers are expected to go late into the night, so, let's get right to capitol hill tonight. Mary Bruce with us live again. And timing for folks at home here. The judiciary committee expected to vote tomorrow. The full house voting next week on impeachment and tonight, you're learning now, new information about the senate trial that is now a foregone conclusion? Reporter: Well, David, we are told that Republicans in the senate want to move quickly here. They are now eyeing a trial of just two weeks. Now, the president has said he wants hunter Biden and the whistle-blower to testify, but Republicans we've talked with say they don't want to hear from any witnesses at all. They simply don't want this to drag on. David? And Mary, you've also learned tonight that senate Republicans are hoping for a quick trial when it comes in January after the holidays, and they're now trying to get president trump onboard with this idea? Reporter: Well, we know that inside the white house, the president's aides are trying to convince him that a shorter trial is actually better for him politically. Their argument is to get this over with and for the president to focus instead of making his case to the American people ahead of the election. David? Mary Bruce watching this into the evening. Mary, thank you.

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

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