President Donald Trump anticipates sending 2,000 to 4,000 National Guard troops to the border with Mexico.

The president described the plan to reporters aboard Air Force One after an event Thursday in West Virginia. He said administration officials are still reviewing the costs of the plan.

“We’ll probably keep them or a large portion of them” until a border wall is built, Trump said of the planned deployment.

Earlier in the day, Homeland Security Secretary Kirstjen Nielsen said she is working with the governors of Texas, New Mexico, Arizona and California on the deployment plan to “start the negotiations.” The Republican governors of Texas, Arizona and New Mexico have expressed support for the move. In California, Democrat Jerry Brown has referred questions to the state’s National Guard Bureau, where an official said they are waiting for details from the federal government.

An expanded version of this report appears on WSJ.com.

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