We wrote below about calling a bluff, and the reasons the deep state is stalling on producing Spygate documents and reports. Here's an afterthought.
Perhaps another motive for stalling is the hope of making Trump mad enough to fire them for foot dragging. Being fired would win them victim status - the left's version of sainthood. Victimhood would go a long way toward inoculating DOJ/FBI bureaucrats against charges of official misbehavior.