Oregon Constitution Art. V § 15b

(1) Every bill which shall have passed the Legislative Assembly shall, before it becomes a law, be presented to the Governor; if the Governor approve, the Governor shall sign it; but if not, the Governor shall return it with written objections to that house in which it shall have originated, which house shall enter the objections at large upon the journal and proceed to reconsider it.

(2) If, after such reconsideration, two-thirds of the members present shall agree to pass the bill, it shall be sent, together with the objections, to the other house, by which it shall likewise be reconsidered, and, if approved by two-thirds of the members present, it shall become a law. But in all such cases, the votes of both houses shall be determined by yeas and nays, and the names of the members voting for or against the bill shall be entered on the journal of each house respectively.

(3) If any bill shall not be returned by the Governor within five days (Saturdays and Sundays excepted) after it shall have been presented to the Governor, it shall be a law without signature, unless the general adjournment shall prevent its return, in which case it shall be a law, unless the Governor within thirty days next after the adjournment (Saturdays and Sundays excepted) shall file such bill, with written objections thereto, in the office of the Secretary of State, who shall lay the same before the Legislative Assembly at its next session in like manner as if it had been returned by the Governor.

(4) Before filing a bill after adjournment with written objections, the Governor must announce publicly the possible intention to do so at least five days before filing the bill with written objections. However, nothing in this subsection requires the Governor to file any bill with objections because of the announcement.