"You'll remember that President Trump has claimed, without evidence, that his campaign was illegally surveilled by the Obama administration. The claim has been denounced at the highest levels of the intelligence community. But the explosive allegation has come up several times as the committee attempts to investigate Russian meddling in the U.S. election, and the handling of classified information in connection to that story. "

My bet is that President Trump found about the AT&T spynet!

Is AT&T & Google part of the NSA’s super SPYNET?

... “AT&T’s internet traffic in San Francisco runs through fiber-optic cables at an AT&T facility located at 611 Folsom Street in San Francisco. Using a device called a “splitter” a complete copy of the internet traffic that AT&T receives – email, web browsing requests, and other electronic communications sent to or from the customers of AT&T’s WorldNet Internet service from people who use another internet service provider – is diverted onto a separate fiber-optic cable which is connected to a room, known as the SG-3 room, which is controlled by the NSA. The other copy of the traffic continues onto the internet to its destination.”
[link to proffer.us]