“President Trump has adopted a sympathetic tone toward the young undocumented immigrants known as Dreamers, who were brought to America as minors. The Obama administration offered them renewable two-year protection from deportation under a policy called Deferred Action for Childhood Arrivals, or DACA. Asked in February about the policy’s future, Mr. Trump pledged to ‘show great heart’ in dealing with these ‘incredible kids.’ Last month he declared that Dreamers should ‘rest easy.’”