ROCKFORD, Ill. (AP) — An Illinois man has pleaded not guilty in federal court to threatening a U.S. representative, who has an office in Rockford.

The official isn't named in the documents, the Rockford Register Star reported. The criminal complaint filed by special agent Gerren Stith refers to the official as Representative A.

Robert F. Fleming, 61, went to the office of Representative A for help with social security on Oct. 31 and spoke with a staff member, according to the complaint. Fleming allegedly demanded his payment for the next day, the complaint says.

The complaint also states that after the employee said he couldn't guarantee the money, Fleming allegedly threatened to "shoot this Congress person in the head for refusing to speak to me."

Fleming has denied that he threatened the representative.

Fleming also was arrested the day before the alleged threat at the Social Security Administration office in Rockford and was charged with assault and disorderly conduct.

The defense and prosecution is currently trying to work out a deferred prosecution agreement in the case, which would require Fleming to complete certain requirements that may include mental health treatment.

A hearing has been scheduled for Nov. 27, but U.S. Magistrate Judge Iain D. Johnston said Fleming could appear in court sooner if an agreement can be reached.

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Information from: Rockford Register Star, http://www.rrstar.com