Barr acknowledged that a president can commit obstruction of justice by destroying evidence or tampering with witnesses. But, he said, he is unaware of any accusation like that in the Mueller investigation, and he said it would “do lasting damage to the Presidency and to the administration of law within the Executive branch” if an act like the firing of ex-FBI chief James Comey could amount to obstruction.

Source: Los Angeles Times December 20, 2018 15:22 UTC