New York Attorney General Letitia James criticized President Donald Trump’s declaration of a national emergency on Friday meant to access funds to build a border wall and indicated she will launch a legal challenge as a result.

“Declaring a National Emergency without legitimate cause could create a Constitutional crisis,” said James, a Democrat who took office this year.

“This action will harm Americans across the country by diverting funds necessary to handle real emergencies and real disasters to advance the President’s personal agenda. We will not stand for this abuse of power and will fight back with every legal tool at our disposal.”

Trump on Friday declared the emergency after a federal budget appropriation bill set aside far less than the $5 billion the president is seeking to build the wall on the southern border with Mexico, a signature campaign pledge.

Legal experts have indicated the declaration is likely to face several legal challenges.