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NASHVILLE, Tenn. — Tennessee is about to become the first state in the nation to offer an online-only sportsbook as the governor says he has reluctantly allowed a sports betting proposal to become law without his signature.

However Gov. Bill Lee on Friday warned that any future attempt to expand gambling throughout the state would result in a veto.

Lee announced he was allowing the bill to become enacted because it did not “pursue casinos,” which he said encourages criminal activity.

The legislation, which has a July 1 effective date, would allow regulated statewide mobile and interactive sports gambling for people 21 and older.

The proposal is projected to bring in more than $50 million annually.

States are increasingly legalizing sports betting after the U.S. Supreme Court cleared the way last year.