They are desperately trying to get their hands on national security correspondence of 45 that bypasses all congressional oversight - including the gang of eight. By attempting to subpoena those docs thought back door means, they are trying to find out exactly what Trump was doing and it is driving them crazy they have been unable to get their hands on that information - Schifty especially. All the legal targeting of Trump and his allies has been an attempt to crack the ability of the executive branch to operate in matters of national security without congressional interference. The game right now is on the clock. Can they find out what landmines Trump put in place before the whole thing blows up? Interesting times for sure.