Sen. Bob Corker, R-Tenn., also said the president "has not demonstrated that he understands the character of this nation" responding to white supremacists.
NPR's Kelly McEvers talks with Nafees Hamid, a terrorism expert for Artis International, who was a few blocks away from Las Ramblas, where the attack in Barcelona occurred on Thursday.
Andrew Roby is an American on vacation in Barcelona and was in the vicinity when a van drove into a crowd of people killing at least a dozen and injuring at least 50.
Companies are waging a broad attack against white supremacist groups, cutting off their ability to raise money, post content or register their sites online. These moves are not unprecedented, but this muscle flexing raises a lot of questions — not just about free speech, but also about due process and who controls the Internet.
Legal fights over racial and partisan gerrymandering are intensifying and mathematicians think they can help. Specialists in geometry are training to become expert witnesses in redistricting cases around the country.
A University of Arkansas professor falsely identified as a participant in a white supremacist rally in Charlottesville says the online reaction was frightening and felt like being chased by a mob.
It's a common refrain from whiskey enthusiasts: Adding a few drops of water to a glass opens up the flavors of the drink. Chemists in Sweden provide a molecular explanation for why this works.
Psychologists Bruce Jessen and James Mitchell devised a list of brutal methods, including waterboarding, that were meant to condition detainees into a state of helplessness.