What most naturally follows?

How to address a senator
Use " the honorable " on the envelope.
" the honorable " is a title typically given to elected officials. When writing to a senator, start with the title and then type the senator's first and last name.
Proper form also typically includes the senator's middle initial. For example, if you were writing to utah republican senator orrin hatch, you would address the letter to " the honorable orrin g.