Barr, who was nominated to his post by Trump four months ago, told a Senate appropriations subcommittee that though he did not have specific evidence of wrongdoing, "I do have questions about it".
The attorney general reiterated that he would try to make public as much of the Mueller report as possible and would rely "on my own discretion" during the redaction process.
Tuesday's hearing came a little more than two weeks after Mueller wrapped up a 22-month-long probe into whether members of Trump's campaign colluded with Russian Federation during the White House race and if he obstructed official inquiries into the matter. The letter said that Mueller did not find a criminal conspiracy between Russian Federation and Trump associates, and that Barr did not believe the evidence in the report was sufficient to prove the president had obstructed justice.
Other Democrats made similar comments on Barr's decisions related to the review of Mueller's probe, which, according to Barr, found no evidence of collusion and did not make a determination on obstruction of justice. Committee Democrats are likely jumping at the chance to pick over the report's grislier details (whatever those might be) with Mueller himself-a potential cable-news soundbite bonanza.
In response, Rep. Doug Collins, the top Republican on the Judiciary Committee, sent Nadler a letter on Monday, arguing that the committee should invite Mueller to testify about his work during the last week of April, after the redacted report comes out.More news: Kim expresses willingness to hold third summit with Trump
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Redacted official documents or reports typically have sections blacked out to protect sensitive information.
Barr reaffirmed to members of the House Appropriations Committee that the first version of the report he plans to release - within one week, he said - would be redacted.
Barr said in a Congressional hearing Tuesday that he is "reviewing the conduct of the investigation and trying to get my arms around all the aspects of the counterintelligence investigation that was conducted during the summer of 2016". She said, "He is not the attorney general of Donald Trump".
"I feel that I have an obligation to ensure government power was not abused", Barr said. Unlike them, it actually stands a chance to offer a bit of national healing.
Instead, the topic of his appearance is the Trump administration's proposed budget for the Justice Department for the fiscal year that begins in October. Specifically, Barr is looking into the standard for opening counterintelligence investigations.
Barr, appearing before a Senate panel, did not say what "spying" may have taken place but seemed to be alluding to a surveillance warrant the Federal Bureau of Investigation obtained on a Trump aide. He said that the letter may have been read to them, but they did not get a hard copy of it. Barr released to the public a four-page summary of its principal conclusions two days after Mueller submitted his report, but many Democrats have called for the full report to be released.