Updated 7:22 p.m. PST

Just an hour after California Gov. Jerry Brown on Sunday signed legislation creating the strongest internet access protections in the country, the Trump administration sued to block the law from taking effect.

The California Internet Consumer Protection and Net Neutrality Act seeks to restore many of the anti-throttling and content-blocking rules originally included in a 2015 order by the Obama administration. Those regulations were rescinded last year by the Republican-controlled Federal Communications Commission.

California's new law prohibits, among other things, service providers from “blocking lawful content” and services and from “impairing or degrading lawful Internet traffic.”

“Net neutrality, at its core, is the basic notion that we each get to decide where we go on the Internet, as opposed to having that decision made for us by Internet service provider,” Sen. Scott Wiener, D-San Francisco, who sponsored the legislation, said Sunday. “It's also about ensuring a level playing field for ideas and for businesses trying to compete. Today marks a true win for the internet and for an open society.”

The U.S. Justice Department on Sunday night filed suit in Sacramento federal court to enjoin the law. The 11-page complaint argues the law is invalid under the Supremacy clause and is preempted by federal law.

California's law “contributes to a patchwork of separate and potentially conflicting requirements from different state and local jurisdictions and thereby impairs the effective provision of broadband services,” DOJ Civil Division lawyers wrote in the complaint.

“Under the Constitution, states do not regulate interstate commerce—the federal government does. Once again the California legislature has enacted an extreme and illegal state law attempting to frustrate federal policy,” U.S. Attorney General Jeff Sessions said in a statement.

Wiener responded to the suit in an email Sunday night: “We've been down this road before: when Trump and Sessions sued California and claimed we lacked the power to protect immigrants. California fought Trump and Sessions on their immigration lawsuit—California won—and California will fight this lawsuit as well. I have complete confidence that Attorney General Xavier Becerra will do a great job defending this law.”

FCC Chairman Ajit Pai, in a speech earlier this month to the Maine Policy Heritage Center, was also critical of the state's net neutrality bill, calling it an “illegal” pursuit by “nanny-state California legislators.”

“The broader problem is that California's micromanagement poses a risk to the rest of the country,” Pai said. “After all, broadband is an interstate service; Internet traffic doesn't recognize state lines. It follows that only the federal government can set regulatory policy in this area. For if individual states like California regulate the Internet, this will directly impact citizens in other states.”

Pai said in a statement Sunday night:

“Not only is California's Internet regulation law illegal, it also hurts consumers. The law prohibits many free-data plans, which allow consumers to stream video, music, and the like exempt from any data limits. They have proven enormously popular in the marketplace, especially among lower-income Americans. But notwithstanding the consumer benefits, this state law bans them.”

California and attorneys from 21 other states and the District of Columbia sued in January to stop the FCC's recission of the 2015 net neutrality order, arguing the action was arbitrary and capricious under the Administrative Procedure Act.

The complaint in United States v. California is posted below:

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