[jjotto]

Jeff Sessions himself picked Rod Rosenstein on the recommendation of Sessions’ long-time pal Chuck Cooper (of Cooper & Kirk). Cooper is considered one of the top few litigators in DC. Rosenstein was also promoted by Chris Christie.

[FreeReign]

Jeff Sessions himself picked Rod Rosenstein on the recommendation of Sessions’ long-time pal Chuck Cooper (of Cooper & Kirk). Cooper is considered one of the top few litigators in DC. Rosenstein was also promoted by Chris Christie.

Cooper was with Sessions when Sessions interviewed Rosenstein. And Cooper probably approved of Rosenstein after the interview. But I believe Cooper didn't know Rosenstein before he met him at the interview.

(excerpt)

Cooper did not know Rosenstein, then a U.S. attorney in Maryland, before the interview. “The fact that he had served for eight years in the Obama administration as a U.S. attorney was a question, I wanted to hear how he could explain that,” Cooper said. “He did, certainly to my satisfaction.

Link

So I don't think it was Cooper who got Rosenstein the interview. As you say it might have been Christie.