The parents of first lady Melania Trump have become legal permanent residents of the United States and are close to obtaining their citizenship, according to people familiar with their status, but their attorney declined to say how or when the couple gained their green cards. Immigration experts said Viktor and Amalija Knavs very likely relied on a family reunification process that President Trump has derided as “chain migration” and proposed ending in such cases. The Knavses, formerly of Slovenia, are living in the country on green cards, according to Michael Wildes, a New York-based immigration attorney who represents the first...