The Islamic State on Tuesday claimed responsibility for Sunday’s attack by two gunmen outside Garland’s Curtis Culwell Center. But while the White House has called the assault an “act of terror,” officials said a possible connection to the extremist group remained under investigation [snip] Sen. Ted Cruz, who is seeking the GOP nomination for president, accused the Obama administration of bungling matters, arguing that federal officials should have intercepted the gunmen before they reached the anti-Muslim event in Garland. “Once again, as with Nidal Hasan and the Tsarnaev brothers, we had radical Islamic terrorists who this administration knew about and...