The e-mail obtained by The Associated Press rails against a contentious immigration bill the Carmel Republican is pushing and refers to him and the country in derogatory terms. It is addressed to "Senator Racist Delph" and mentions Delph's wife and five daughters by name.
Delph declined to comment on the e-mail Thursday.
Senate Chief of Staff Jeff Papa says the Senate gave police the e-mail after an aide saw it Thursday. State police didn't immediately return messages seeking comment.