So basically the R strategy is to talk to Mueller like he's a piece of shit, and ask him questions that they already know he can't answer, either because of Barr or ongoing investigations in an attempt to have a bunch of clips that make Mueller look like he's avoiding questions.
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@th3j35t3r they need to provide the soundbites that will prove they are good little foot soldiers to the President. It's all posturing for 45's benefit.