SACRAMENTO (CBS / AP) — 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.

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.

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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 .

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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.

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