AG has some authority to declassify and can ask the DNI to do so. The main reason is that the AG can bring charges for lying, leaking, and the crimes Trump refers to as treason. He uses the treason word to give the AG more power in getting confessions.
The media asked him who he thought was treasonous. At first he said he didn't know. Then he said Comey, McCabe and "people higher up". Then added Strzok and his lover.
El Correcto.