I believe that in the last day or so Rosenstein stated that he would run an investigation into the spying.
I searched for news of it, and found that the Inspector General was tasked with seeing an investigation was executed.
Will that fall to Rosenstein? I don’t know.
Rosenstein did voice a need for it. Will the Inspector General task Rosenstein and thereby Mueller with it. I honestly don’t know.
I do think it’s interesting that Rosenstein popped up on the subject. Why would it be his place to address the issue?
Is he planning on being the force behind the investigation? Seems possible with his attention on it already.
http://www.chicagotribune.com/news/nationworld/politics/ct-trump-fbi-spy-20180520-story.html
Rosenstein asking the IG to investigate something he already knows the answer to, and that he was involved in is nothing more than a delaying tactic. He damn well knows the answers right now.