Congress has blocked inquiries into their split loyalty as far as them having multiple citizenship in other countries. If you were McDonald's board of directors would you allow someone to be on both the McDonald's board and Wendy's?
Congress isn't personally harmed by a surveillance state unless you consider they may all be being blackmailed but that is another conversation. In fact mass surveillance widens the barrier to new entries into politics as they can use whatever dirty they find and give it to federally funded media mouthpieces.
This week we saw articles of sexual crimes against children being swept under the rug to "protect our country" do we really think that congress would actively pursuit this line of inquiry?