A U.S. federal judge on Thursday sharply rebuked Attorney General William Barr's handling of the special counsel's Russia report, suggesting Barr may have made a "calculated attempt" to spin the investigation's findings in favour of President Donald Trump and had shown a "lack of candor."

U.S. District Judge Reggie Walton delivered the criticism in a 23-page ruling in which he said he would review an unredacted version of the Mueller report before deciding what additional information from the document should be publicly disclosed under a Freedom of Information Act lawsuit.

The Justice Department in April released a 448-page redacted version of Mueller's report, which examined ties between Russia and the 2016 presidential campaign and potential obstruction of justice by the president. BuzzFeed News and the Electronic Privacy Information Center later sued for access to the entire document.

In his ruling, Walton said he needed to review the document itself because he could not trust that the Justice Department's redactions of the report were made properly and in good faith. Walton said it would be "disingenuous" to presume the redactions were "not tainted by Attorney General Barr's actions and representations" throughout the process.

The actions cited by the judge include Barr's release last March of a four-page summary of Mueller's findings. The summary said that Mueller had found insufficient evidence to establish a criminal conspiracy between the Trump campaign and Russia to tip the 2016 election, and that Mueller had not reached a determination on the question of whether the president had obstructed to justice.

Serious questions

Mueller complained to Barr in a private letter and phone call that he had not adequately captured the seriousness of his report's conclusions. He stressed in his report, and in later public statements, that he did not exonerate the president and that it was not an option to charge Trump because of longstanding policy that sitting presidents cannot be indicted.

Barr, for his part, has defended his handling of the report, calling Mueller's letter to him "a bit snitty." He said it was his prerogative as attorney general to give a quick summary of the report, which he referred to as "my baby," while his staff spent weeks on redactions.

The judge said he struggled to reconcile Barr's public characterizations of the report — which included his statement that Mueller found "no collusion" between the Trump campaign and Russia — with what the document actually said.

Those inconsistencies, Walton wrote, "cause the Court to seriously question whether Attorney General Barr made a calculated attempt to influence public discourse about the Mueller Report in favour of President Trump despite certain findings in the redacted version of the Mueller Report to the contrary."