Washington (CNN) A criminal complaint and arrest warrant were issued Thursday against a 55-year-old Tomah, Wisconsin man accused of threatening to kill President Barack Obama.

Brian D. Dutcher, 55, allegedly told a security guard at a La Crosse library, "the usurper is here and if I get a chance I'll take him out and I'll take the shot," referring to Obama, who was in Wisconsin promoting his proposal for overtime pay reform.

According to the warrant, Dutcher confirmed in an interview with the Secret Service that he made the remarks to the security guard.

Brian D. Dutcher, 55, is accused of threatening to kill President Barack Obama.

The warrant also says Dutcher posted on Facebook on June 30 "that's it! Thursday I will be in La Crosse. Hopefully I will get a clear shot at the pretend president. Killing him is our CONSTITUTIONAL DUTY!"

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