Every bill passed by the legislature shall, before it becomes a law, be presented to the governor for approval. If he approves, he shall sign it, and deposit it with the secretary of state; otherwise, he shall return it to the house in which it originated, with his objections, which shall be entered at large upon the journal; and such bill shall not become a law unless thereafter approved by two-thirds of the members present and voting in each house by yea and nay vote entered upon its journal. Any bill not returned by the governor within three days, Sundays excepted, after being presented to him, shall become a law, whether signed by him or not, unless the legislature by adjournment prevent such return. Every bill presented to the governor during the last three days of the session shall be approved by him within twenty days after the adjournment and shall be by him immediately deposited with the secretary of state. Unless so approved and signed by him such bill shall not become a law. The governor may in like manner approve or disapprove any part or parts, item or items, of any bill appropriating money, and such parts or items approved shall become a law, and such as are disapproved shall be void unless passed over his veto, as herein provided. (As amended September 15, 1953.)