DES MOINES, Iowa (NewsNation) — Iowa's largest school district filed a lawsuit Friday against the consulting company it hired to identify superintendent candidates, alleging the company did not properly vet an educator who was arrested by immigration authorities last week. The lawsuit comes as more about his past achievements face mounting skepticism.

U.S. immigration officials have said Ian Roberts, a Guyana native, was in the U.S. illegally and had no work authorization. Federal prosecutors charged Roberts on Thursday with possessing four firearms while in the U.S. illegally, including one authorities said was wrapped in a towel inside the Jeep Cherokee he was driving when agents pulled him over, according to court filings.

According to Justice Department documents, Roberts filed for p

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