Apologize if this has already come up…but I think I found the guy McCabe had the "dramatic" phone call with that's mentioned in the IG report.
William J. Baer
https:// www.justice.gov/archives/asg/staff-profile/former-principal-deputy-associate-attorney-general-william-j-baer
http:// www.executivegov.com/2016/04/bill-baer-named-doj-acting-associate-attorney-general-loretta-lynch-comments/
https:// www.washingtonpost.com/world/national-security/no-3-at-justice-department-is-stepping-down/2016/04/05/d41a777e-fa98-11e5-886f-a037dba38301_story.html?noredirect=on&utm_term=.26530ef643b6