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FIRST ON FOX: The U.S. Citizenship and Immigration Services (USCIS) office conducted an unprecedented large-scale investigation in Minneapolis this month, focused on those who were committing marriage and asylum fraud .

Under a mission known as Operation Twin Shield, officers targeted 1,000 cases, knocking on doors at more than 900 sites to conduct interviews and review immigration criteria. Coordinating with Immigration and Customs Enforcement (ICE) and the FBI, they found fraud, non-compliance, or public safety and national security concerns in 275 cases.

It’s the first operation after a new rule finalized earlier this month allowed USCIS to expand its law enforcement duties.

In 44 of those cases, the immigrants were r

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