“This amendment is authored by Sen. John Cornyn (R-Texas), and it’s being tacked on to a pending Senate bill. If passed, the Electronic Communications Privacy Act Amendments Act of 2015 would mandate a warrant for the government to access e-mail and data stored online. (The House unanimously passed its companion version, known as the Electronic Communications Privacy Act, in April 2016.)”
Source: FBI seeks expanded National Security Letter to include browser history and more | Ars Technica