The parents of first lady\u00a0Melania Trump\u00a0became naturalized U.S. citizens on Thursday, taking the oath in a private ceremony in New York, according to their attorney.\r\nViktor and Amalija Knavs are originally from Slovenia but have lived in the United States for over a decade, during which time they gained permanent legal residency, said Michael Wildes, the couple's immigration lawyer.\r\nWildes told reporters the couple "have travailed a wonderful journey like millions have, in getting citizenship and waiting the requisite period of time."\r\n\u00a0\r\nHe said that despite having the president of the United States for a son-in-law, the Knavses followed a process to gain their citizenship that "was no different than anybody else's."\r\nThe White House declined to comment on the Knavses' newly acquired citizenship status, saying they were "not part of the administration and deserve privacy."\r\nAfter living between Trump Tower and Mar-a-Lago for several years, Viktor and Amalija Knavs reportedly moved to the Washington suburbs following Trump's inauguration,and are frequently spotted traveling with the first lady and the Trumps' son, Barron Trump.\r\nThe question of how the Knavses originally gained their green cards has become a controversial one since Trump won the presidency on an anti-immigration platform. Trump has frequently railed against the family visa system, or so-called chain migration, which permits U.S. citizens to sponsor their family members for visas.\r\nEven so, experts\u00a0say chain migration\u00a0is the most likely way the Knavses gained their permanent residency in the United States.