FEINSTEIN: You still have a situation where a president essentially tries to change the lawyer’s account in order to prevent further criticism of himself.
BARR: Well, that’s not a crime.
FEINSTEIN: So you can, in this situation, instruct someone to lie?
BARR: To be obstruction of justice, the lie has to be tied to impairing the evidence in a particular proceeding. McGahn had already given his evidence, and I think it would be plausible that the purpose of McGahn memorializing what the president was asking was to make a record that the president never directed him to fire — and there is a distinction between saying to someone, “Go fire him, go fire Mueller,” and saying “Have him removed based on conflict.”