An Omaha man was arrested by the FBI on Friday after he made threats to "kill" U.S. Senator Joni Ernst (R-Iowa), according to a report from the DesMoines Register.

Robert William Simet, 64, was charged and arrested for threatening a U.S. official on Friday in Omaha, according to a press release from the U.S. Attorney’s Office in the Southern District of Iowa. The FBI is currently investigating the case.

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According to reports, employees of a motorcycle shop in Pacific Junction, Iowa, where Ernst was scheduled to speak at an event on Saturday, told an FBI agent that Simet said he “could kill” Ernst at the event and accused her of being a member of the Islamic State.

Simet is currently in custody in Council Bluffs, and is waiting to appear before a magistrate in the Southern District of Iowa on Tuesday.

The Hill has reached out to Ernst’s office for comment.