Do you think whatever the IG says will force Sessions to act? I am not sure myself but “something is wrong with Sessions’ position(s) and actions.
There are two paths - the DoJ will formally receive the report from IG and then forward to Congress. They (Sessions + Wray) may include something explaining what they have done to address any issues or recommendations in the IG report; note there are actually three IG’s in play - Horowitz, NSA (which Rogers initiated and then referred to FISC acknowledging there had been illegal intercept requests) and one other, I believe under DNI but don’t recall. The IG report will go to congress with over 1.2 million pages of supporting documents & a public referral + findings will be made on the oig website. If DoJ does not act, then statute provides that Congress can then return referrals to them.