Democrats on the panel made sure to point out, a few times, that Rosenstein is a republican. We republicans know that there are never-Trumpsters in the republican party, and Rosenstain sounds and acts like one. RINOs are also republicans, and never-Trumpsters are never going to give up their chances are blocking Trump or actually removing him from office.
On top of that he has implications to Uranium One and wants the obfuscation in that matter to continue unabated.
Sounds like the Dems KNOW he’s dirty.