Yes — the Attorney General can personally be held in contempt, and unlike the President he enjoys no special exemption.

Consequences: civil contempt (coercive — daily fines until compliance, not pardonable); criminal contempt (punitive — fines or, rarely, jail, and is pardonable by the President).

Obligatory IANAL, but this is the law and has in the past indeed at most been pushed as far as a strongly worded letter.