The Republican chattersphere has been eagerly anticipating the conclusion of Inspector General Michael Horowitz’s inquiry into alleged surveillance abuses by the Justice Department and the FBI, although it’s not entirely clear what might be in the final report. Federal investigators have conducted more than 100 interviews, including one with former British spy Christopher Steele, whose infamous dossier may have helped to secure a FISA warrant for former Trump campaign adviser Carter Page. Horowitz’s office declined to comment. But there are signs that the inspector general is continuing to pursue, separately, the answer to an equally explosive question: Exactly who at the FBI was talking to reporters about the Hillary Clinton email investigation—and possibly to Trump colleagues like Rudy Giuliani?

That was one cliff-hanger that Horowitz left unresolved with his previous 539-page report, on the FBI’s actions leading up to the 2016 president election, which focused on the bureau’s controversial investigation of Clinton’s use of a private email server. That report detailed how FBI director James Comey’s fateful decision to publicly announce the discovery of additional, possibly relevant emails in the closing weeks of the campaign was driven significantly by his fear of leaks from his own agents. The final two unclassified pages of Horowitz’s June 2018 tome are graphic renderings of the problem: starburst diagrams with “reporter” at the center, and multiple lines radiating outward to trace hundreds of unauthorized contacts between journalists and FBI officials.

Justice Department insiders suspect that at least one of those unauthorized contacts may have involved Giuliani, then a surrogate for the Trump campaign. On October 26, 2016, Giuliani appeared on Fox News to tease “a surprise or two that you’re going to hear about in the next few days.” Two days later, Comey wrote a letter to Congress disclosing the discovery of Clinton emails on a laptop belonging to Anthony Weiner, the husband of Clinton aide Huma Abedin. Giuliani called in to a radio show shortly after the news broke to describe the “revolution” he said was going on inside the FBI because of the decision to close the Clinton probe. “I know that from former agents,” he said. “I know that even from a few active agents who obviously don’t want to identify themselves.”

Giuliani wasn’t the only one who claimed to have ears inside the FBI. “I’ve talked to about 15 different agents today—both on the job and off the job—who are basically worried about the reputation of the agency they love,” James Kallstrom, the former head of the FBI’s New York office, told Megyn Kelly in July 2016, when Comey first announced that Clinton wouldn’t be charged. In October, Kallstrom was back on Fox to say, “I know some of the supervisors, and I know the senior staff…If it’s pushed under the rug, [the agents] won’t take that sitting down.” There appeared to be leaks to Republican lawmakers too. Last year, California Congressman Devin Nunes, then the head of the House intelligence Committee, said “good FBI agents” had told him that Weiner’s laptop contained Clinton emails a month before the seizure of Weiner’s computer became public. (Giuliani and Nunes did not respond to requests for comment. Kallstrom could not be reached.)

Giuliani has subsequently claimed he had no inside FBI information, and that the “surprise” he was referring to was something about new “advertising” by the Trump campaign. Yet Horowitz appears to be investigating what was behind his public statements. In June 2018, Giuliani told HuffPost that two FBI agents working for the inspector general had questioned him about the preelection statements. Horowitz has also issued two smaller findings about FBI media contacts in the past year: one alleging that an unnamed deputy assistant director accepted a gift and may have leaked information, another dinging a “senior FBI official” for “a lack of candor” and accepting sports tickets. (On Thursday, Horowitz released a report excoriating Comey—who has said he suspected Giuliani of leaking FBI information to the media—for leaking memos that documented his interactions with Trump.)