President Donald Trump's in-laws, Viktor and Amalija Knavs, took the oath of citizenship, Wildes said.
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He did not specify how long it had taken the Knavs to complete the citizenship process, nor whether the 48-year-old First Lady had sponsored their permanent residency.
Trump has taken a hardline on immigration policy, criticizing so-called chain migration that allows naturalised US citizens to sponsor close relatives for permanent residency.
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The Republican president argues that the system steals jobs from Americans and threatens national security, calling for a merit-based system that preferences more educated, English-speaking professionals.
Viktor Knavs, a car salesperson in Slovenia, and Amalija, who worked in a textile factory, are over 70 years old, retired and pass much of the year in the United States, where they regularly spend time with their daughter and grandson Barron.
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