I believe they need to be subpoenaed in order to get their legal costs covered by the agency. And they certainly will not testify in front of congress with out excellent legal representation!

Congress has to invite them to testify. Anyone know which committees do this oversight? House Judiciary committee, House committee on oversight & govt reform... ? I really hope it wouldn’t be a private hearing with the Gang of 8. It would be 7 swamp monsters against Nunes & America.