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WASHINGTON (AP) - Private tensions between Justice Department leaders and Robert Mueller's team broke into public view in extraordinary fashion Wednesday as Attorney General William Barr pushed back at the special counsel's "snitty" complaints over his handling of the Trump-Russia investigation report.

Testifying for the first time since releasing Mueller's report, Barr said he was surprised Mueller did not reach a conclusion on whether President Donald Trump had tried to obstruct justice, and that he had felt compelled to step in with his own judgment that the president had committed no crime.

READ MUELLER'S LETTER TO BARR

"I'm not really sure of his reasoning," Barr said of Mueller's obstruction analysis, which neither accused the president of a crime nor exonerated him. "I think that if he felt that he shouldn't go down the path of making a traditional prosecutive decision then he shouldn't have investigated. That was the time to pull up."

Barr was also perturbed by a private letter Mueller sent him last month complaining that the attorney general had not properly portrayed the special counsel's finding. Barr called the note "a bit snitty."

"I said 'Bob, what's with the letter? Just pick up the phone and call me if there is an issue,'" Barr said.

The airing of disagreements over the handling of the report followed Mueller's two-year investigation into Russian interference to help Trump in the 2016 campaign and the possibility that Trump's team conspired with the Russians. During most of the investigation, the Justice Department and Mueller's team seemed to be unified in approach.

Republican and Democratic lawmakers have been anything but unified. And their partisan divide was on full display during Wednesday's contentious Judiciary Committee hearing, which included three Democratic presidential candidates.

Some Republicans, in addition to defending Trump, focused on the president's 2016 Democratic opponent Hillary Clinton's email and campaign practices and what they argued has been a lack of investigation of them.

As the hearing was getting underway, Trump tweeted his familiar "NO COLLUSION, NO OBSTRUCTION." Though Mueller reached no conclusion on obstruction, he did report that his probe established no collusion between the Trump team and Russia.

Democrats, for their part, moved to exploit the daylight between Barr and Mueller to attack the attorney general's credibility and accuse him of unduly spinning the special counsel's report in the president's favor. Some also called for Barr to resign, or to recuse himself from Justice Department investigations that have been spun off from Mueller's probe.

They also pressed him on whether he had misled Congress last month when he professed ignorance about complaints from the special counsel's team. Barr suggested he had not lied because he was in touch with Mueller himself and not his team.

Unswayed, Democrat Patrick Leahy of Vermont said, "Mr. Barr, I feel your answer was purposely misleading, and I believe others do too."

Barr sought to minimize the rift by suggesting the special counsel's concerns were largely about process, not substance.

Barr's appearance gave him his most extensive opportunity to explain the department's actions, including his press conference held before the Mueller report's release.

Barr has also been invited to appear Thursday before the Democratic-led House Judiciary panel, but the Justice Department has said he would not testify if the committee insisted on having its lawyers question him.

Neither side broke much new ground Wednesday on the specifics of Mueller's investigation, though Barr did articulate a robust defense of Trump as he made clear his firm conviction that there was no prosecutable case against the president for obstruction of justice.

He was asked by Sen. Dianne Feinstein, the committee's top Democrat, about an episode recounted in Mueller's report in which Trump pressed White House Counsel Don McGahn to seek the removal of Mueller on conflict-of-interest grounds. Trump then asked McGahn to deny a press report that such a directive had been given.

Barr responded, "There's something very different firing a special counsel outright, which suggests ending an investigation, and having a special counsel removed for conflict -- which suggests you're going to have another special counsel."

Barr entered the hearing on the defensive following reports hours earlier that Mueller had complained to him in a letter and over the phone about the way his findings were being portrayed.

Two days after receiving Mueller's report, Barr had released a four-page letter that summarized the main conclusions.

Mueller's letter, dated March 27, conveyed his unhappiness that Barr released what the attorney general saw as the bottom-line conclusions of the investigation and not the introductions and executive summaries that Mueller's team had prepared and believed conveyed more nuance and context than Barr's own letter. Mueller said he had communicated the same concern two days earlier.

"There is now public confusion about critical aspects of the results of our investigation," Mueller wrote in his letter to Barr. "This threatens to undermine a central purpose for which the Department appointed the Special Counsel: to assure full public confidence in the outcome of the investigations."

Barr appeared unmoved by the criticism. He said repeatedly that Mueller had assured him that Barr's letter of conclusions was not inaccurate but he simply wanted more information out. Barr said he didn't believe a piecemeal release of information was beneficial, and besides, it wasn't Mueller's call to make.

Once Mueller submitted his report, his work was done and the document was "my baby," Barr insisted defiantly.

"It was my decision how and when to make it public. Not Bob Mueller's."

Barr also complained that Mueller did not, as requested, identify grand jury material in his report when he submitted it, slowing down the public release of the report as the Justice Department worked to black out sensitive information.

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Barr's public defense of his actions rebutted complaints by Mueller, expressed in a letter and phone call, that the attorney general had not adequately portrayed the investigation's findings. The revelation of that letter hours earlier amplified allegations from Democrats that Barr had spun the investigation's findings in Trump's favor.

Democrats were also likely to accuse him of misleading lawmakers last month when he suggested he was unaware of concerns on the Mueller team about his actions.

Barr's appearance Wednesday before the Senate Judiciary Committee gave the attorney general his most extensive opportunity to explain the department's actions, including his press conference held before the report's release, and for him to repair a reputation bruised by allegations that he's the Republican president's protector.

While Democratic senators bluntly questioned his actions, Republicans, in addition to defending Trump, focused on the president's 2016 Democratic opponent Hillary Clinton's email and campaign practices and what they feel is a lack of investigation of them.

Barr noted that Mueller concluded his investigation without any interference and that neither the attorney general nor any other Justice Department official overruled the special counsel on any action he wanted to take. Barr also defended his decision to step in and clear the president of obstruction of justice after Mueller presented evidence on both sides but didn't reach a conclusion.

"The Deputy Attorney General and I knew that we had to make this assessment because, as I previously explained, the prosecutorial judgment whether a crime has been established is an integral part of the Department's criminal process," Barr said.

A major focus of the hearing was Tuesday night's revelation that Mueller told Barr, in a letter to the Justice Department and in a phone call, that he was frustrated with how the conclusions of his investigation were being portrayed.

Mueller's letter, dated March 27, conveys his unhappiness that Barr released what the attorney general saw as the bottom-line conclusions of the special counsel's investigation and not the introductions and executive summaries that Mueller's team had prepared and believed conveyed more nuance and context than Barr's own letter. Mueller said he had communicated the same concern two days earlier.

"There is now public confusion about critical aspects of the results of our investigation," Mueller wrote. "This threatens to undermine a central purpose for which the Department appointed the Special Counsel: to assure full public confidence in the outcome of the investigations."

At an unrelated hearing last month, Rep. Charlie Crist of Florida asked Barr about media reports of frustration within the special counsel's office about the way the report's findings were characterizing. Asked if he knew what those concerns referred to, Barr said, "No, I don't."

Barr also has been invited to appear Thursday before the Democratic-led House Judiciary panel, but the Justice Department has said he would not testify if the committee insisted on having its lawyers question the attorney general.

Democrats pressed Barr on statements and actions in the past six weeks that have exasperated them. The tense relations are notable given how Barr breezed through his confirmation process , picking up support from a few Democrats and offering reassuring words about the Justice Department's independence and the importance of protecting the special counsel's investigation.

The first hint of discontent surfaced last month when Barr issued a four-page statement that summarized what he said were the main conclusions of the Mueller report. In that letter, Barr revealed that he and Deputy Attorney General Rod Rosenstein had cleared Trump of obstruction of justice after Mueller and his team found evidence on both sides of the question but didn't reach a conclusion.

Barr says he released the report on his own even though he didn't have to under the special counsel regulations, and that doing so fulfilled a pledge he made at to be as transparent as the law allowed.

After the letter's release, Barr raised eyebrows anew when he told a congressional committee that he believed the Trump campaign had been spied on, a common talking point of the president and his supporters. A person familiar with Barr's thinking has said Barr, a former CIA employee, did not mean spying in a necessarily inappropriate way and was simply referring to intelligence collection activities.

He also equivocated on a question of whether Mueller's investigation was a witch hunt, saying someone who feels wrongly accused would reasonably view an investigation that way. That was a stark turnabout from his confirmation hearing, when he said he didn't believe Mueller would ever be on a witch hunt.

Then came Barr's April 18 press conference to announce the release of the Mueller report later that morning.

He repeated about a half dozen times that Mueller's investigation had found no evidence of collusion between the campaign and Russia, though the special counsel took pains to note in his report that "collusion" was not a legal term and also pointed out the multiple contacts between the campaign and Russia.