"These are vital matters dealing with constitutional prerogatives vested in the presidency," If this means that the President should be able to break laws then it's time for these perogatives to be un-vested in the presidency.
If the top officer of our nation is above the law then this oligarchy has grown too big for its britches, and will have to be dealt with accordingly.
Ahaaa? You conclude that there is actually a law involved here when it isn't. Well, the law doesn't allow the AG to give details to an open investigation no matter who it may protect and it doesn't give congress the right to see everything the AG or President does.