States ask judge to stop construction of Trump border wall

California on Friday led a group of 20 states in requesting that a federal judge stop President TrumpDonald John TrumpNASA exec leading moon mission quits weeks after appointment The Hill's Morning Report — After contentious week, Trump heads for Japan Frustration boils over with Senate's 'legislative graveyard' MORE from diverting federal funds to build his wall on the southern border.

The state attorneys general announced their request for the preliminary injunction as Trump traveled to California to visit a segment of the border wall.

In the filing, the states argue that Trump’s declaration of a national emergency in order to divert federal funding to the wall from other sources is unconstitutional, and that construction of the wall under those circumstances would cause irreparable damage.

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“Notwithstanding the president’s expressed frustration with Congress and the legislative process, he must act in accordance with the procedures established in the Constitution to obtain funding for his border wall,” the filing reads.

The states also claim that construction of the wall could cause “possible irreparable harm to endangered species” living near the border, and that the administration has violated the National Environmental Policy Act by not studying the potential environmental impact of the wall.

The states’ request came just hours after the American Civil Liberties Union also asked a federal judge to implement a preliminary national injunction to halt construction of the border wall.

Trump declared a national emergency earlier this year following shortly after a 35 day partial government shutdown after Congress refused to pass a funding bill granting him his requested amount of funding to construct the border wall.

Attorney General William BarrWilliam Pelham BarrThe Hill's Morning Report — After contentious week, Trump heads for Japan House Intelligence enjoys breakthrough with Justice Department Schiff blasts Trump's 'un-American' order to intel agencies to cooperate with Barr probe MORE said at the time that Trump had the legal authority and standing to declare the national emergency. And Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenCongressional Hispanic Caucus demands answers on death of migrant children Trump expected to tap Cuccinelli for new immigration post Kobach gave list of demands to White House for 'immigration czar' job: report MORE and other immigration officials have since called the situation at the border a crisis.

Trump earlier this week threatened to shut down the border with Mexico. But he later backed off that position, saying that he will give Mexico a year to stem illegal immigration and drug trafficking happening on the southern border.