Pause the Republicans have to do is ask him under oath if he has coordinated with the Democrats on what questions to ask and how to answer.
I wonder...
democrat: Did Trump collude with the Russians?
Mueller: Yes, but I couldn’t indict a sitting president.
democrat: Did Trump obstruct justice?
Mueller: Yes, but I couldn’t indict a sitting president.
Republican: Did you coordinate with the democrats on what questions to ask and how to answer them?
Mueller: I’m sorry, I can’t answer that because the DOJ told me I can only address what’s in the Report.