Sorry, but Nancy blinked and sidestepped here. Their m.o. is to rachet and escalate, and 'Well, he has no moral authority now!' is not something that will take them to the next level of getting him out of there. It's just a weak retort to try and shift to the long game now.
Sessions can simply redirect the script by going after govt criminality. After that no one will care about Russia. The narrative will collapse around them.