Interference

The Attorney General has very special obligations, unique obligations.  He holds in trust the fair and impartial administration of justice.  It is the Attorney General's responsibility to enforce the law evenhandedly and with integrity.  The Attorney general must ensure that the administration of justice -- the enforcement of the law -- is above and away from politics.  Nothing could be more destructive of our system of government, of the rule of law, or the Department of Justice as an institution, than any toleration of political interference with the enforcement of the law.

-- US Attorney General nominee William P. Barr, in his written testimony to the Senate Judiciary Committee, quoting himself from his 1992 confirmation hearing to the same post, 15 January 2019