The U.S. Navy is planning to build massive tent cities to house thousands of immigrants in several states, according to a document obtained by TIME.

A draft memo for Navy Secretary Richard Spencer describes the potential tent cities as “temporary and austere," and details plans to build facilities in three states: Alabama, Arizona and California, TIME reports.

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The planned facilities would house as many as 25,000 migrants in Alabama, 47,000 people at the former Concord Naval Weapons Station in California, and another 47,000 people at Camp Pendleton, the Marines training facility in California.

The document, which TIME reports was authored by Phyllis L. Bayer, the assistant secretary of the Navy for energy, installations and environment, proposes a 60-day timeline for building the first temporary facility, which would house 5,000 adults. An additional 10,000 adults per month could follow, the document adds.

Navy spokesman Capt. Greg Hicks declined to comment on the document in a statement to the magazine.

“It would be inappropriate to discuss internal deliberative planning documents,” he told TIME.

News of the planned expansion of the detainment facilities follows President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's executive order this week that's designed to end the process of separating migrant children from their parents ahead of prosecution.

National outrage over the policy grew after pictures of distressed children behind chain-link fencing and audio of crying children was released, sparking condemnation of the policy from both Republicans and Democrats.