A contentious "Rightwing Extremism" report that warned of military veterans as possible recruits for terrorist attacks against the U.S. was not authorized, has been withdrawn and is being rewritten, Homeland Security Secretary Janet Napolitano told Capitol Hill lawmakers. "The wheels came off the wagon because the vetting process was not followed," Ms. Napolitano told the House Homeland Security Committee on Wednesday. "The report is no longer out there," she said. "An employee sent it out without authorization." The report was shared with state and local law enforcement officials nationwide via the department's internal Web site on April 7, angering Republican...