A Wisconsin man is in custody for threatening to kill President Barack Obama after allegedly telling 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.”

Brian D. Dutcher, 55, of Tomah, was taken into custody after confirming his threat to the Secret Service, KTLA reports.

According to the warrant for his arrest, Dutcher also posted a threat against the president on Facebook on June 30, reading, “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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President Obama was appearing in La Crosse to pitch his plan to expand overtime pay for workers.

According to a detective who interviewed Dutcher, the would-be assassin said that his threat was serious and that “he would not have said what he said if he didn’t intend to carry it out.”

Dutcher is currently being held pending a court appearance.