The report, written by Inspector General Michael Horowitz, details the investigation that US Attorney General Jeff Sessions cited when he fired McCabe hours before he was set to retire and receive his full pension.
McCabe's anonymous disclosure, the report concludes, "violated the FBI's and the Department's media policy and constituted misconduct".
The FBI officials "told us that they each received calls from McCabe admonishing them for leaks contained in the October 30 WSJ article about the [Clinton Foundation] Investigation", the report says.
Then-acting FBI Director Andrew McCabe on Capitol Hill in May 11, 2017. "No collusion, all made up by this den of thieves and lowlifes!" the president wrote on Friday afternoon. Page sought to put a positive spin on McCabe and the FBI's handling of the investigation.More news: Backpage co-founder likely to get out of jail
McCabe was sacked by Attorney General Jeff Sessions last month, two days before his scheduled retirement. The inspector general began its work on the report more than a year ago, and the report has always been anticipated in Washington. "And the rush to fire him, at the goading of the president, was unworthy of the great traditions of the Department of Justice", McCabe's counsel said in the statement on Friday.
McCabe called the Washington official and "admonished him regarding leaks in the article", the official said. He also misled the FBI's Office of Professional Responsibility about the leaks.
But its conclusion may also be hard for Democrats to embrace, given its harshly critical suggestion that McCabe had put his personal reputation above the interests of the Federal Bureau of Investigation. Jerry Nadler, the top Democrat on the House Judiciary Committee, said in a statement.
"The Inspector General found not only did McCabe divulge sensitive information, he did it without the permission, authority, or knowledge of his supervisor", said House Oversight Chairman Trey Gowdy.
The OIG determined that McCabe was, indeed, "authorized to disclose the existence of the [Clinton Foundation] Investigation publicly if such a disclosure fell within the "public interest" exception in applicable FBI and DOJ policies generally prohibiting such a disclosure of an ongoing investigation". In particular, McCabe authorized Special Counsel and AD/OPA to disclose to Barrett the contents of a telephone call that had occurred on August 12, 2016, between McCabe and the then-Principal Associate Deputy Attorney General ("PADAG"). Though the statement or suggestion was not under oath, it still got McCabe in trouble.