A lawyer for Viktor and Amalija Knavs says the Slovenian couple took the citizenship oath on Thursday in New York City.
They had been living in the US as permanent residents.
The Knavses raised Melania in the rural industrial town of Sevnica while Slovenia was under Communist rule.
Viktor was a car dealer. Amalija worked in a textile factory. They came and went from the ceremony at a Manhattan federal building flanked by Homeland Security police.
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