In other words, Trump is still really pissy about the Russia probe—even though it was never public—and wants to ensure that none of the other corrupt activities he is surely engaged in will interfere in his election, not to mention get investigated at all.
Barr, a man who skewed the rollout of the Mueller report in Trump's favor and declined to investigate Trump Ukraine call for criminal violations, advised, "we also must be sensitive to safeguarding the department’s reputation for fairness, neutrality and nonpartisanship.” Whatever reputation the Justice Department had for delivering fairness is already long gone under Barr's leadership.
In the big picture, this is just one more move by Barr to consolidate power. During the Senate impeachment trial, Barr also installed a loyalist as the new U.S. attorney in D.C., the largest U.S. attorney’s office in the country that also happens to handle many of the most politically sensitive cases in Washington. In another recent development, the Justice Department, which had recently sought six months of jail time for former Trump national security adviser Michael Flynn, is now saying probation time would be acceptable.
In ways both obvious and cunning, Barr continues to prove his commitment to doing Trump’s bidding, no matter the task.