Strassel wrote, "Mr. Barr made real news in that Senate hearing, and while the press didn’t notice, Democrats did. The attorney general said he’d already assigned people at the Justice Department to assist his investigation of the origins of the Trump-Russia probe. He said his review would be far-reaching ‐ that he was obtaining details from congressional investigations, from the ongoing probe by the department’s inspector general, Michael Horowitz, and even from Mr. Mueller’s work. Mr. Barr said the investigation wouldn’t focus only on the fall 2016 justifications for secret surveillance warrants against Trump team members but would go back months earlier.

"He also said he’d focus on the infamous dossier concocted by opposition-research firm Fusion GPS and British former spy Christopher Steele, on which the FBI relied so heavily in its probe. Mr. Barr acknowledged his concern that the dossier itself could be Russian disinformation, a possibility he described as not "entirely speculative." He also revealed that the department has "multiple criminal leak investigations under way" into the disclosure of classified details about the Trump-Russia investigation.

"Do not underestimate how many powerful people in Washington have something to lose from Mr. Barr’s probe. Among them: Former and current leaders of the law-enforcement and intelligence communities. The Democratic Party pooh-bahs who paid a foreign national (Mr. Steele) to collect information from Russians and deliver it to the FBI. The government officials who misused their positions to target a presidential campaign. The leakers. The media. More than reputations are at risk. Revelations could lead to lawsuits, formal disciplinary actions, lost jobs, even criminal prosecution."