A 16-state coalition filed a lawsuit against President Donald Trump’s administration on Monday, requesting the court to issue a judicial determination that Trump’s national emergency declaration over the southern border wall is unconstitutional.

California Attorney General Xavier Becerra announced the lawsuit, saying Trump’s declaration of a national emergency at the border is unlawful and constitutional. “Unlawful southern border entries are at their lowest point in 20 years, immigrants are less likely than native-born citizens to commit crimes, and illegal drugs are more likely to come through official ports of entry. There is no credible evidence to suggest that a border wall would decrease crime rates.”

The complaint charges Trump with violating the Constitution’s separation of powers and appropriations clauses, saying there is “no objective basis” for the emergency declaration, and that even the president has said that an emergency declaration is not necessary.

The federal government’s own data prove there is no national emergency at the southern border that warrants construction of a wall. … The thwarting of congressional intent to fund a vanity project that not only will fail to safeguard national security, but is positioned to cause significant harm to the public safety, public fisc, environment, and well-being of Plaintiff States’ residents, cries out for judicial intervention.

The 15 states that joined California in the lawsuit include: Colorado, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Minnesota, Nevada, New Jersey, New Mexico, New York, Oregon, Virginia and Michigan. They allege they will suffer both economic and environmental harm if the emergency declaration takes full effect.