Of course the Dems are seeking to demonize Barr ahead of the revelations of the Durham investigation. Good luck with that!
I assume that, as usual, Barr will refuse to be interrogated by staff attorneys, which means that clowns like Nadler and other Dem reps on the committee will have to tangle with Barr themselves. The fact that staff attorneys will have provided them with questions won't make their task any easier.
Barr has the law and the constitution on his side. I fully expect him to swat these lightweights aside, treating them with the same good humored contempt he exhibited toward Dem senators during his Senate testimony. But this time he may be more inclined to go on the offensive.
UPDATE--Major but brief. Nunes with Maria: AG Barr’s testimony would be bad for Democrats:
About two minutes in, Nunes enters into a major discussion of the whole trajectory of the Russia Hoax after the election. He states specifically that by January, 2017, DoJ knew the Russia Hoax was BS, and by February, 2017, Nunes' HPSCI had heard back from all 17 members of the Intel Community, and there was no evidence of "collusion". This is undoubtedly what's driving Barr/Durham. It's what leads through Boente and Rosenstein straight to Team Mueller. It's what has Dems soiling their pants.