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PHILADELPHIA (CBS/CNN) – New Jersey and Delaware joined 14 other states in filing a lawsuit challenging President Donald Trump’s national emergency declaration on Monday evening.

The group of states, led by California Attorney General Xavier Becerra, filed the lawsuit in the United States District Court for the Northern District of California.

The attorneys general from Colorado, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Michigan, Minnesota, Nevada, New Jersey, New Mexico, New York, Oregon and Virginia joined California in the lawsuit.

“The real national emergency is a President who refuses to adhere to the rule of law,” said New Jersey Attorney General Gurbir S. Grewal. “In its effort to cater to a select few on the right, this Administration is trampling on our Constitution and circumventing the will of Congress. As the chief law enforcement officer for New Jersey, I have a duty to stand up for New Jersey’s residents – including our immigrant community – and so I’m joining states across the country in challenging this emergency declaration in court.”

“We cannot devolve into a system where Congress chooses not to fund something and the president – whoever it is in the White House – simply can grab other funds to do what he wants,” said Delaware Attorney General Jennings. “Everyone from the Founding Fathers to members of Congress to seventh-grade social studies students know that’s not the way it is supposed to work, and that it is dangerous to start down that road.”

The lawsuit is the latest challenge to hit the Trump administration, which already faces a litany of lawsuits over the national emergency declaration. Over the weekend, the Center for Biological Diversity, Border Network for Human Rights, which marched with Beto O’Rourke in El Paso, Texas, last week, and the American Civil Liberties Union all announced lawsuits.

At the core of each lawsuit is the argument that Trump is circumventing Congress to fund the wall along the US-Mexico border by declaring an emergency.

Demonstrators Gather At City Hall To Protest President Trump’s National Emergency To Build Border Wall 

“The Constitution assigns Congress the power of the purse, and no prior president has ever tried to use emergency powers to fund a chosen project — particularly a permanent, large-scale domestic project such as this — against congressional will. This is obviously improper,” said Dror Ladin, staff attorney with the ACLU’s National Security Project.

California Attorney General Xavier Becerra argued that the states have standing to challenge Trump because money appropriated to them might be at risk.

“If the President is essentially stealing money that’s been allocated to go to the various states for various purposes but no longer will, we’re being harmed, our people are being harmed,” said Becerra.

The wave of lawsuits was expected, though fighting them in court will likely be difficult.

The National Emergencies Act allows the President to declare a national emergency and unlock a stash of funds by invoking certain statutory authority. The President has wide discretion over what constitutes a national emergency. As a result, legal experts argue that fighting the declaration on the basis of the emergency itself will likely be difficult. The other question is whether the statute Trump has invoked — which in this case, requires the use of the armed forces — can be used to fund the wall.

Under the declaration, the administration will tap $2.5 billion of military narcotics funding and $3.6 billion in military construction funding. Acting US Defense Secretary Patrick Shanahan said he will start studying which projects to pull from and determine whether border barriers are necessary to support the use of the armed forces.

It’s not just lawsuits that the administration has to face, but also the possibility of a joint resolution put forth by House Democrats to terminate the declaration.

The resolution would need to be voted on by the House and then the Senate, before heading to the President’s desk.

On Sunday, White House adviser Stephen Miller indicated that Trump would cast the first veto of his presidency if lawmakers tried to terminate the declaration.
National emergencies can last for one year and then terminate, unless the President renews the declaration 90 days prior, said Robert Chesney, who served in the Justice Department and teaches at the University of Texas at Austin School of Law. Every six months, Congress can consider whether to put forward a joint resolution to terminate the emergency.

According to the Brennan Center, there have been 58 national emergencies between 1978 and 2018. Of those, 31 are still in effect today.

(©Copyright 2019 CBS Broadcasting Inc. All Rights Reserved.The-CNN-Wire™ & © 2019 Cable News Network, Inc., a Time Warner Company contributed to this report.)