Mike Rogers ..., the former US Representative., was a Special Agent for the FBI in Chicago from 1989 - 1994 (I didn't know him, but recall hearing the office buzz when Rogers resigned to go into politics). More to the point, after leaving the House in 2014, having served as Chairman of the Permanent Select Committe on Intelligence, Rogers joined the Trump campaign in 2016 as national security adviser. (You can locate other references to this Mike Rogers here.)
By the way--you won't find any mention of the six months Rogers spent on the Trump campaign on his Wikipedia page. Interesting, isn't that? But look here and here. It appears Rogers came on board the Trump campaign in May, 2016, once it became clear that Trump would be the GOP nominee. Again, it's difficult to imagine a more sensitive position in a presidential campaign--especially one that was being targeted for destruction by the Deep State--than national security adviser. And Rogers' Deep State ties were well known to DC insiders. Which led sundance to ask, way back then, "So how did Decepticon Rogers come to be an advisor to the Trump campaign?"
Late yesterday, sundance again drew attention to Rogers, noting that footnote 474 in the OIG FISA report may refer to Rogers, although without naming him. If true, this would mean that Rogers was an FBI Confidential Human Source (CHS - informant) while he was working for the Trump campaign as its national security adviser.
Before we delve into that a bit further, lets get some of the previous background on record again. Some of this was and remains speculative, but is highly suggestive: