The FBI and Capitol Police on Thursday arrested a man accused of threatening Rep. John Lewis, D-Ga., and his staff.

Dante Antoine Rosser made the threats after “demanding that Congressman Lewis and his staff seek financial reparations on his and his family’s behalf” starting in January of last year, authorities told WXIA in Atlanta.

Rosser is accused of calling Lewis’ office 46 times between on Feb. 22 and 23, allegedly telling a staffer at one point “I will blow your head off. You’re dead.”

During an appearance in federal court in Atlanta on Thursday, Rosser appeared confused and nervous, the TV station reported, at one point saying he did not understand the charges against him. A preliminary hearing is scheduled for Monday.

Rosser has an arrest record in Atlanta that goes back to a 1991 felony charge of cocaine possession. He was arrested at least six more times and charged with abandonment of a minor charge, simple battery and contempt.