What ought to be the proper role of Congress in Strategic Intelligence?

What ought to be the proper role of Congress in Strategic Intelligence? Is there a proper role in oversight of strategic intelligence activities, in ensuring that the policy expressed in budget and appropriations laws is being followed, in ensuring that the will of the people and the necessity of national security is being carried out properly by the executive branch of government?  

If I could get help with the above.  I have a min of 500 words, any help would be awesome!