Show me the tribe and I'll show you the crime.
In order to get to Trump they have to get past Attorney General Barr so they traduce him just as they have traduced Trump.
The Democrats' problem with respect to bar is that he has neither the persona nor the record to justify their slanders.
I think the dems have already contacted Mueller to provide a narrative that will cast doubt on Barr’s testimony. I think Mueller is more than willing to lie if necessary and throw his church buddy under the bus. Mueller’s letter and it’s timely release demonstrates he’s a backstabber.