(CNN) — The Trump administration is moving to reinterview certain refugees who were admitted to the United States under former President Joe Biden as part of a comprehensive review of their cases, according to an internal memo and a source familiar with the plans.

The effort marks an unprecedented step in President Donald Trump’s immigration crackdown — this time, targeting one of the world’s most vulnerable populations. Refugees must show that they were persecuted or face persecution in their home countries and undergo rigorous vetting prior to entering the United States in what is generally a yearslong process.

Trump officials have scrutinized the admissions program, which has historically had bipartisan support, and argued that the previous administration didn’t sufficiently vet the

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