Britain's Prime Minister David Cameron was at the White House today to talk about international terrorism. At a joint news conference, President Obama addressed the issue of home-grown terrorism in the United States, calling our biggest advantage that "our Muslim populations …feel themselves to be American. He also lauded the "incredible process of immigration and assimilation that‘s part of our tradition and it's probably our greatest strength."
Meanwhile, security forces in France, Belgium and Germany have been rounding up suspected terrorists for the past two days. Sebastian Rotella covers terrorism and international crime for ProPublica. He's author of a new novel on those themes, The Convert's Song.