They are not Barr’s powers. They are President Trump’s and they are his absolute right. NOBODY can overrule him if he wants to declassify.
Barr is his subordinate, executing his lawful presidential orders.
Every source and method must be torched. They were used in a coup attempt and America should know what to be on guard for in the future. Halper, Sztyoke and Paige, McCabe, Yates, Rice, Comey, Brennan and many others should face decades in prison.
Execute them.
All of them.
If and only if (in the mathematical sense) they are guilty.
That way an incoming Dem President can't pardon them.