California Governor Jerry Brown signed a net neutrality bill [materials] into law Sunday, drawing an immediate lawsuit [complaint, PDF] from the US Department of Justice (DOJ) [official site].

The suit alleges [press release] that the bill “unlawfully imposes burdens on the Federal Government’s deregulatory approach to the Internet.” US Attorney General Jeff Sessions said that “[u]nder 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.”

In its complaint, the DOJ is seeking a preliminary injunction in order to invalidate the law, saying that it is “preempted by federal law and therefore violates the Supremacy Clause of the United States Constitution.”