The Knavses are from Slovenia, but now divide their time between New York City, Palm Beach, and Washington, D.C., where they stay with the Trumps in the White House.
The Knavs' immigration attorney accompanied the couple to the ceremony.
Viktor and Amalija Knavs, Melania Trump's Slovenian-born parents, took the oath of citizenship in NY on Thursday, their lawyer confirmed.
Viktor and Amalija Knavs had been living in the U.S. as permanent residents.
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Their lawyer Michael Wildes - who attended the ceremony with them - told reporters outside they had met the five year condition but refused to give more details, according to the New York Times. He confirmed that the first lady sponsored their green cards.
Trump has taken a hardline on immigration policy, criticizing so-called main migration that allows naturalized USA citizens to sponsor close relatives for permanent residency.
Melania Trump became a US citizen in 2006 after marrying Trump the year before. That type of family visa is exactly one of the categories that Trump and his allies have tried to repeal, saying they are harmful to the US.
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The update will be released later this month, and the new mode will be available to those who have completed the story campaign. Lastly, users can now skip all of the in-game cinematics in normal and New Game Plus after they've beaten the game once.
"They would appreciate their privacy and we just thank everybody for their attention for this very important dialogue we're having on immigration". A smaller number go to immigrants based on their employment, and other categories include refugees and other special cases.
In a phone call on Thursday evening, Wildes declined to comment on whether Viktor and Amalija Knavs support President Trump's push to curb family-based sponsorship.
Wildes wouldn't comment on how the Knavs received their green cards or citizenship Thursday, but criticized the Trump administration's immigration policies to CNN.
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