Next is Rod Rosenstein's oversight of the investigation.
Attorney General Jeff Sessions recused himself for reasons I still don't understand, almost immediately after becoming AG, ultimately to avoid any appearance of bias in the investigation. Apparently because Sessions was introduced (by a Democrat) and shook hands with the Russian ambassador for maybe 60 seconds and didn't disclose that meeting when asked at his confirmation hearing.
Acting in Sessions' place, Deputy Attorney General Rod Rosenstein then appointed Robert Mueller to lead the special investigation.
First off, Rosenstein has far more conflict of interest than Sessions. Rosenstein, Mueller, and Comey are all friends and have worked together for over 20 years, and have acted as each other's wingmen. That alone should have recused Rosenstein from participating in the investigation, let alone appointing Mueller, a close personal friend.
Second, Rosenstein is one of the officials who signed off on at least one of the four illegal FISA warrants to spy on Carter Page (and through Page, the entire circle of his phone and e-mail communications within the Trump campaign, surveillance of conversations with everyone he communicated with). Submitting knowingly false evidence (the Russia Dosser as "verified") to a federal judge is a prosecutable federal crime. So Rosenstein is ultimately participating in an investigation of a case in which he will ultimately be a defendant. Rosenstein is at once supervising the investigation, a witness to what occurred in the FBI's investigation, and a potential defendant in the investigation.
Already, we have corruption and conflict of interest up the yingyang.
Rosenstein only recently ceased to control the investigation, ending with the appointment of Willam Barr as the new attorney general in Feb 2019.
And Rosenstein finally resigned and finished his last day as Deputy Attorney General of the DOJ just about two weeks ago, on May 11, 2019.
