What's causing surge in gun violence -- and how to stop it

This summer is shaping up to be a bloody one in many cities and neighborhoods. What’s behind the recent surge in gun violence? Amna Nawaz talks to Pastor Mike McBride of the Live Free Campaign, a faith-based movement committed to reducing gun violence and ending mass incarceration of people of color, and Thomas Abt of the Council on Criminal Justice and an author of the nationwide homicide study.