Homeland Security Secretary John F. Kelly said Wednesday that his agents are not actively trying to deport illegal immigrant Dreamers, but pleaded with Congress to pass a bill granting them a more permanent legal status, saying only lawmakers can solve the problem. Mr. Kelly declined to take a position on whether the 2012 amnesty President Obama created for Dreamers is legal, but said the program, known in government circles as DACA or Deferred Action for Childhood Arrivals, is still in effect. He said “illegals” who have been properly approved for DACA will be safe from deportation, but said those who...