California Gov. Gavin Newsom (D) on Friday announced plans to sue President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE for declaring a national emergency to access funds for a southern border wall.

“President Trump is manufacturing a crisis and declaring a made-up ‘national emergency’ in order to seize power and subvert the constitution,” Newsom said in a statement hours after the president’s declaration. “Our message back to the White House is simple and clear: California will see you in court.”

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California Attorney General Xavier Becerra Xavier BecerraState AGs condemn HUD rule allowing shelters to serve people on basis of biological sex OVERNIGHT ENERGY: Trump casts doubt on climate change science during briefing on wildfires | Biden attacks Trump's climate record amid Western wildfires, lays out his plan | 20 states sue EPA over methane emissions standards rollback 20 states sue EPA over methane emissions standards rollback MORE said at a news conference that Trump does not have the power to "act frivolously" to redirect federal funding away from where it has been appropriated by Congress, which has "power to direct dollars, the power of the purse."

"This is not 9/11," he said. "This is not the Iran hostage crisis of 1979. This is a president showing his disdain for the rule of law and the U.S. constitution."

Trump declared a national emergency to bypass Congress and spend roughly $8 billion on barriers along the southern border.

He is also expected to sign legislation that was approved by Congress to fund the government, which will prevent another government shutdown.

However, the legislation did not include the $5.7 billion Trump had demanded for the border wall.

Becerra said there was one thing Trump got right when he announced his declaration during a news conference in the Rose Garden at the White House.

"President Trump got one thing right this morning about his declaration when he said he didn’t have to do this. He’s right," Becerra said. "In fact, he can’t do this."

Trump's concession that he "didn't have to do this" was quickly seized upon by his critics to argue an emergency does not exist along the U.S.-Mexico border.

Newsom said it was "ironic and interesting" that Trump was focused on the U.S.-Mexico border instead of directing federal funding to "real disasters" such as the devastating wildfires that tore through California last year.

Becerra said the state was reviewing the declaration closely and would likely file a lawsuit with other states.