Congress needs to be directly involved. The DOJ cannot be responsible for investigating the DOJ and the FBI. A Congressional investigation has to be at least a major part of this.
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The problem there is that only a handful of THOSE scumbags aren’t utterly corrupt. The RATS will block anything that helps the President. The deep-state, anti-Trump Republicans will join them. There simply aren’t enough good, honest people there to make a difference.
The Congress will have to respond to public pressure. Corrupt or not, a third of the Senate and all of the House is up for reelection NOW, and they will be able to read the handwriting.