“Mr. Barr was also wary of departing from Justice Department practice not to disclose derogatory details in closing an investigation, according to two government officials familiar with Mr. Barr’s thinking. They pointed to the decision by James B. Comey, the former F.B.I. director, to harshly criticize Hillary Clinton in 2016 while announcing that he was recommending no charges in the inquiry into her email practices.”

“The officials and others interviewed declined to flesh out why some of the special counsel’s investigators viewed their findings as potentially more damaging for the president than Mr. Barr explained, although the report is believed to examine Mr. Trump’s efforts to thwart the investigation. It was unclear how much discussion Mr. Mueller and his investigators had with senior Justice Department officials about how their findings would be made public. It was also unclear how widespread the vexation is among the special counsel team, which included 19 lawyers, about 40 F.B.I. agents and other personnel.”

“At the same time, Mr. Barr and his advisers have expressed their own frustrations about Mr. Mueller and his team. Mr. Barr and other Justice Department officials believe the special counsel’s investigators fell short of their task by declining to decide whether Mr. Trump illegally obstructed the inquiry, according to the two government officials. After Mr. Mueller made no judgment on the obstruction matter, Mr. Barr stepped in to declare that he had cleared Mr. Trump of wrongdoing.”

“Representatives for the Justice Department and the special counsel declined to comment on Wednesday on views inside both Mr. Mueller’s office and the Justice Department. They pointed to departmental regulations requiring Mr. Mueller to file a confidential report to the attorney general detailing prosecution decisions and to Mr. Barr’s separate vow to send a redacted version of that report to Congress. Under the regulations, Mr. Barr can publicly release as much of the document as he deems appropriate.”

“A debate over how the special counsel’s conclusions are represented has played out in public as well in recent weeks, with Democrats in Congress accusing Mr. Barr of intervening to color the outcome of the investigation in the president’s favor.”

“In his letter to Congress outlining the report’s chief conclusions, Mr. Barr said that Mr. Mueller found no conspiracy between Mr. Trump’s campaign and Russia’s 2016 election interference. While Mr. Mueller made no decision on his other main question, whether the president illegally obstructed the inquiry, he explicitly stopped short of exonerating Mr. Trump.”

“Mr. Mueller’s decision to skip a prosecutorial judgment “leaves it to the attorney general to determine whether the conduct described in the report constitutes a crime,” Mr. Barr wrote. He and his deputy, Rod J. Rosenstein, decided that the evidence was insufficient to conclude that Mr. Trump had committed an obstruction offense.”

“Mr. Barr has come under criticism for sharing so little. But according to officials familiar with the attorney general’s thinking, he and his aides limited the details they revealed because they were worried about wading into political territory. Mr. Barr and his advisers expressed concern that if they included derogatory information about Mr. Trump while clearing him, they would face a storm of criticism like what Mr. Comey endured in the Clinton investigation.”

“Legal experts attacked Mr. Comey at the time for violating Justice Department practice to keep confidential any negative information about anyone uncovered during investigations. The practice exists to keep from unfairly sullying people’s reputations without giving them a chance to respond in court.”

“Mr. Rosenstein cited the handling of the Clinton case in a memo the White House used to rationalize Mr. Trump’s firing of Mr. Comey.”

“Though it was not clear what findings the special counsel’s investigators viewed as troubling for Mr. Trump, Mr. Barr has suggested that Mr. Mueller may have found evidence of malfeasance in investigating possible obstruction of justice. “The report sets out evidence on both sides of the question,” Mr. Barr wrote in his March 24 letter.”

“Mr. Mueller examined Mr. Trump’s attempts to maintain control over the investigation, including his firing of Mr. Comey and his attempt to oust Mr. Mueller and Attorney General Jeff Sessions to install a loyalist to oversee the inquiry.”

“The fallout from Mr. Barr’s letter outlining the Russia investigation’s main findings overshadowed his intent to make public as much of the entire report as possible, a goal he has stressed since his confirmation hearing in January. He reiterated to lawmakers on Friday that he wanted both Congress and the public to read the report and said that the department would by mid-April furnish a version with sensitive material blacked out. He offered to testify on Capitol Hill soon after turning over the report.”