More likely, McConnell is aware of things that - in his view - simply cannot be allowed come out. The great game of "Let's Pretend we are still a Constitutional Republic" has to continue. But McConnell, like many other Republicans, sees Trump's bull-in-a-china-shop approach to managing political scandal as a bigger threat to the remnants of the Republic than Democrat knavery.
“Let’s Pretend we are still a Constitutional Republic”
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There’s a lot of that going around