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

The man who has been charged with threatening to kill President Donald Trump after being fired from his job as a university teaching assistant for flipping a Turning Point USA table on campus ignored warnings from federal law enforcement about his violent social media posts, according to an FBI affidavit.

On Oct. 9, eight days before he was arrested for disorderly conduct and criminal damage to property after a viral video showed him flipping a Turning Point USA table on the Illinois State University campus, Derek Lopez, 27, was interviewed by federal agents over his online posts.

"Multiple times during t

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