Comey made the claim Clinton’s emails could have been accessed, Horowitz chastised him in the report for making the statement without any evidence.
https://www.politico.com/story/2018/06/14/doj-watchdog-james-comey-hillary-clinton-server-647020
“The DOJ IG
report blasted Comey for this statement, saying he “insinuated that hostile foreign actors may have in fact gained access to former Secretary Clinton’s private email account, based almost entirely on speculation and without any evidence from the … investigation to support his claim.”
That assessment is just one part of a much larger IG investigation that criticizes the former FBI director's role leading the Clinton investigation ahead of the 2016 presidential election.
According to the report, an FBI forensics agent told the IG’s office that he was “fairly confident that there wasn’t an intrusion,” and a letterhead memorandum, or LHM, summarizing the FBI’s findings said there was no “evidence confirming that Clinton’s email server systems were compromised by cyber means.”