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Gregory Bull
FILE - In this Oct. 26, 2018, file photo, mounted Border Patrol agents ride along a newly fortified border wall structure in Calexico, Calif. President Donald Trump is visiting Calexico on Friday, April 5, 2019, to tour the recently-built portion of the border fence that bears a silver plaque with his name on it. (AP Photo/Gregory Bull, File)

SACRAMENTO, Calif. — California and 19 other states that are suing President Donald Trump over his emergency declaration to build a border wall have requested a court order to stop money from being diverted to fund the project.

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California Attorney General Xavier Becerra said Friday that the group took action to prevent $1.6 billion from being siphoned away from fighting drug trafficking and funding military construction projects.

Becerra says it's important to block the diversion of funds before it happens because it will harder to replace if the money is committed to border wall construction .

The action is part of the states' lawsuit challenging Trump's emergency declaration to fund a wall on the U.S.-Mexico border. The coalition says the declaration was unconstitutional because it bypasses the role of Congress to authorize funding.