Oregon Revised Statutes Elections § 247.195

(1) The county clerk, at any time, may inquire into the validity of the registration of any elector. The county clerk shall mail a written statement to the elector that describes the nature of the inquiry and provides a suitable form for reply.

(2) Not later than the 20th day after the date of mailing of the statement, the elector, in writing, may state that the information on the registration card is correct or may request a change in the information on the card. Upon receipt of the statement or request, the county clerk shall determine whether the information satisfies the inquiry. If the county clerk determines that the inquiry has not been satisfied, the county clerk shall schedule a hearing and shall notify the elector of the place and time of the hearing. The hearing shall be held not sooner than the second nor later than the 20th day after notice is given. At the hearing, the elector may present evidence of qualification. If the county clerk, upon the conclusion of the hearing, determines that the elector's registration is not valid, the county clerk shall cancel the registration.