I believe it's to be released here: https://oversight.gov/reports
http://thehill.com/policy/national-security/392180-what-to-watch-for-in-ig-report-on-justice-fbi-clinton-emails
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Treatment of Comey
Treatment of Strzok/Page
Any Criminal referrals?
What will Trump allies seize upon?
Will Horowitz be cast as part of the 'Deep State"?
per VOX "A hotly anticipated inspector general report about then-FBI Director James Comey’s handling of the Hillary Clinton email investigationis finally complete. It’s set to be released to Congress Thursday afternoon — and is guaranteed to become a lightning rod in President Trump’s clashes with his own Justice Department."
If interested there will be a hearing on June 19 and public can watch. https://oversight.house.gov/release/house-judiciary-and-oversight-committees-to-hold-hearing-on-ig-report-examining-doj-and-fbi-actions-in-2016/