[crosslink]

A constitutional republic will not function with a corrupt AG. This is a perfect example. The congress does not have the power to compel testimony when they know their referrals of wrong doing will be ignored by the justice dept. There was a slim chance the DC circuit could address wrong doing but Obama and Reid fixed that with their stacking of the court.

[Ray76]

Here is a primer discussing Congressional inquiry, subpoena, and enforcement powers.

http://www.constitutionproject.org/documents/when-congress-comes-calling-a-primer-on-the-principles-practices-and-pragmatics-of-legislative-inquiry/