Homeland Security Secretary Janet Napolitano said Friday that illegal immigrant students and young adults who meet the criteria in last year’s failed legalization bill in Congress are not a “priority” for her department’s law enforcement efforts. Wading into an increasingly thorny debate, Miss Napolitano said she cannot unilaterally ignore deportations laws for broad groups of illegal immigrants, but said students and young adults who would have been legalized had last year’s “Dream Act” legislation passed Congress are not a chief target of federal authorities. “I will say, and can say, that you know what? They are not, that group, if...