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This story is part of Fox News Digital’s investigative series Campus Radicals. Get the full series here.

FIRST ON FOX: A former teaching assistant who was fired by Illinois State University was arrested in a joint operation by FBI and Secret Service agents on Tuesday.

Derek Lopez, 27, has been charged with threatening President Donald Trump, according to the bureau.

“The arrest follows a month-long investigation coordinated with the above agencies, which also included the Illinois State University Police Department, regarding Lopez’s online and in-person activities,” according to an FBI memo obtained by Fox News Digital. “Lopez is alleged to have recently made threats against a sitting President, which prompted the current federal charges.”

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