TULSA, Okla. (AP) — A man known for showing up uninvited at political events to get close to politicians has been charged with threatening an Oklahoma congressman and his family, officials said Monday.

Keith Charles Eisenberger, 39, of Bartlesville, Oklahoma, is charged with threatening to assault, kidnap, or murder U.S. Rep. Kevin Hern; threatening to assault, kidnap, or murder an immediate family member of Hern's; and cyberstalking, according to a statement from the U.S. attorney's office in Tulsa.

According to a criminal complaint, Eisenberger began making concerning statements about Hern a...