A good, short article here.

https://nypost.com/2019/02/14/why-we-should-thank-andrew-mccabe-for-his-dishonorable-service/

"Barr testified that he was “shocked” when he saw such blatant evidence of bias against Trump, and promised to investigate the investigators.He can begin by getting to the bottom of the conflicting roles Rosenstein played. In charge after his former boss, Jeff Sessions, recused himself, Rosenstein advocated that Trump fire Comey, then used the firing as a pretext for appointing Mueller. He also signed the final secret court application, thus giving a misleading endorsement of the Steele dossier.

Yet Rosenstein, a career prosecutor who is expected to resign now that Barr is taking over, nonetheless developed a good relationship with the president, and it somehow endured the Times report last September of the 25th Amendment plot."