New York Times foreign correspondent Rukmini Callimachi discusses the latest lone wolf attacks in the U.S., involving two men who shot at a security officer outside an event in Texas that featured cartoons of the prophet Mohammad -- and how incidents like this frame the debate over government surveillance. 

There's been about 4K foreign fighters going from the West to fight in Syria, but only about 200 have been from the US, says @rcallimachi.

— Brian Lehrer Show (@BrianLehrer) May 6, 2015

.@rcallimachi says this suggests the US is doing something right -- maybe people do assimilate better here in the US than in Western Europe.

— Brian Lehrer Show (@BrianLehrer) May 6, 2015