The Department of Justice said it is filing a lawsuit against the state of California over its new net neutrality protections, hours after Gov. Jerry Brown signed the bill into law on Sunday.

The California law would be the strictest net neutrality protections in the country, and could serve as a blueprint for other states. Under the law, internet service providers will not be allowed to block or slow specific types of content or applications, or charge apps or companies fees for faster access to customers.

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Barbara van Schewick, a professor at Stanford Law School, says the California bill is on solid legal ground and that California is within its legal rights.

“An agency that has no power to regulate has no power to preempt the states, according to case law. When the FCC repealed the 2015 Open Internet Order, it said it had no power to regulate broadband internet access providers. That means the FCC cannot prevent the states from adopting net neutrality protections because the FCC’s repeal order removed its authority to adopt such protections,” said van Schewick.

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The original FCC rules included a two page summary and more than 300 additional pages with additional protections and clarifications on how they worked. While other states mostly replicated the two-page summary, California took longer crafting its law in order to match the details in the hundreds of supporting pages, said van Schewick.

“Most people don’t understand how hard it is to do a solid net neutrality law,” said van Schewick. “What’s so special about California is that it includes not just two pages of rules, but all of the important protections from the text of the order and as a result closes the loopholes.”

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Sohn and van Schewick believe states with legislatures controlled by Democrats are the ones most likely to pass strong net neutrality protections. Other states have already started working on similar bills, including New York and New Mexico.