https://www.vice.com/en_us/article/ep4d97/congress-has-no-idea-how-much-web-browsing-data-the-fbi-collects

With Congress looking to renew the PATRIOT Act, privacy advocates are scrambling to re-attach a provision that would prevent law enforcement agencies from collecting Americans’ web histories without a warrant.

But as usual, fighting the government’s secretive spying powers means taking shots in the dark. For one, Congress doesn’t even really know how much web browsing data federal agencies are collecting.