Surveillance and sex-trafficking on Congress' to-do list

People walk and jog across the East Plaza of the Capitol as Congress prepares to return from the Christmas recess on Tuesday, Jan. 2, 2018. Photo: Bill Clark/ CQ/ Roll Call via Getty)

Lawmakers are coming back later this month. So are the big battles over tech policy.

The most urgent: The Section 702 surveillance law — used by the intelligence community to justify warrantless surveillance of electronic communications of foreign nationals located abroad — expires in mid-January, thanks to a short-term extension Congress passed before leaving for the holidays.