AG Barr is a disgrace, and his alarming efforts to suppress the Mueller report show that he's not a credible head of federal law enforcement. He should resign—and based on the actual facts in the Mueller report, Congress should begin impeachment proceedings against the President.

— Elizabeth Warren (@ewarren) May 1, 2019

Warren has come out strongly for Barr to resign.

Harris's questioning of Barr was surgical:

I was watching this too. Booker couldn’t stifle his enjoyment of Kamala Harris’ devastating questioning of AG Barr today. https://t.co/ZkZ97QIVxt

— John Aravosis 🇺🇸 (@aravosis) May 1, 2019

Arguably today was Senator Harris' strongest moment as a United States Senator. She did real damage to William Barr (even more than had already been done). https://t.co/IHmlU941KX

— Joy Reid (@JoyAnnReid) May 1, 2019