As far as I can see (I haven’t read it; it’s very long), the gist is as expected:
The IG found justification to investigate the Russia investigation and did not find any “intentional misconduct or political bias.” However, the investigators discovered many “significant” errors concerning the FISA warrant on former Trump campaign adviser Carter Page.
The IG report stated the investigators “did not find documentary or testimonial evidence that political bias or improper motivation influenced the FBI’s decision to seek” the first FISA authority on Page.
Yet the report says the team “found that the FBI did not have information corroborating the specific allegations against” Page described in Christopher Steele’s dossier.
Horowitz provided the “seven significant inaccuracies and omissions” in the first application…
Unless the FBI authorities were stupid enough to write in an email or memo “I am doing this because I hate Donald Trump and for no other reason,” there is no way that Horowitz’s team could have found “documentary or testimonial evidence that political bias or improper motivation” caused the chain of events. So that’s the sort of thing that can almost never be proven; it’s hard to imagine a set of circumstances under which such evidence could be found.
But that such bias existed we know full well from the Strzok and Page emails as well as the actual politics of Comey et al. And that the FISA application and the entire Crossfire Hurricane probe was loaded with irregularities and “errors” is also known and detailed in the Horowitz Report. One can infer that the bias led to the irregularities, but one can’t prove it.
The seven “inaccuracies and omissions” can be found at the link as well. In addition, there were ten “additional significant errors” in the renewal applications.
The Horowitz Report seems to go for the “fool” explanation in the old “knave vs. fool” question. Or rather, it goes for the “we can’t prove they are knaves but we can prove they are fools if they are not knaves” explanation, which is a bit more complex. I say “knaves and fools.”
There’s further reaction at Mark Meadows’ Twitter account. For example:
Wow… page 341. IG says FBI used an Aug. 2016 'defensive briefing' with the Trump campaign as an "opportunity to gather potentially relevant investigative information” about Michael Flynn
They used defensive briefings for their investigation into the Trump campaign
Wow
— Mark Meadows (@RepMarkMeadows) December 9, 2019
You won't see this in headlines, because it proves EXACTLY what we've been saying.
FBI used knowingly false and dubious information in a FISA as an excuse to surveil American citizens in the Trump campaign. And kept using the same bad info in renewals!
Stunning abuse of power. https://t.co/lM2zdDONVI
— Mark Meadows (@RepMarkMeadows) December 9, 2019
BREAKING: IG report officially released. It reveals FBI "fell far short" in vetting accuracy of FISA applications, knowingly withheld exculpatory information, used 'defensive briefings' to secretly asses the Trump campaign, used known illegitimate sources, and more.
— Mark Meadows (@RepMarkMeadows) December 9, 2019
[ADDENDUM: More here. And here’s a link to Durham’s official statement.]

