First lady Melania Trump’s parents were sworn in as U.S. citizens Thursday.

Viktor and Amalija Knavs, both in their 70s, took the citizenship oath at a special, private ceremony in New York City. The Slovenian immigrants, a former car dealer and textile factory worker, had been living in the U.S. as permanent residents.

The Knavses slipped in and out of a side entrance at a Manhattan federal building flanked by Department of Homeland Security police. They said little other than Viktor telling a reporter “thank you” when she asked how they felt about becoming Americans.

The couple’s lawyer said they had “travailed a wonderful journey.”

Lawyer Michael Wildes said the Knavses applied for citizenship on their own and didn’t get any special treatment. He wouldn’t say who sponsored their green cards.