[Dead Corpse]

I've asked that same question. It does happen from time to time at a more local level. To my uncertain knowledge, it has never been used against a Congresscritter.

I'm assuming it'd have to be routed via Holder's DoJ...

As I've also stated before, I have ZERO faith that the system will fix itself or otherwise work as it is supposed to via checks and balances.

[NFHale]

“..checks and balances....”

It won’t fix itself, because the people who are supposed to be checking and balancing are part of the problem.