HARRISBURG, Pa. — Pennsylvania’s Democratic governor on Monday approved legislation authorizing a major expansion of gambling in what is already the nation’s second-largest commercial casino state.

Governor Tom Wolf Monday signed a bill that will make the state the fourth to allow online gambling.

The measure will allow the state’s 10 largest casinos to apply for the right to operate satellite casinos and put video gambling terminals inside truck stops. It also would allow gambling parlors in airports.

The gambling legislation aims to produce about $200 million annually from casino license fees and taxes on higher gambling losses.

Pennsylvania casinos rake in more gross revenues than any other state except Nevada. Pennsylvania is the number-one state in tax revenue from the casino industry, netting about $1.4 billion during the most recent fiscal year.

Wolf said the state needs revenue to help shore up its operating budget and that there is other pressure to expand gambling.

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