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Texas and Arizona officials said the first 400 soldiers will be in place within days, and Defense Secretary James Mattis said the Pentagon would foot the bill for the full 4,000, if needed, through September. (DHS photo by Adam Theo)

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What happened when Bush, Obama sent troops to Mexico border

Since he launched his run for president, Donald Trump has said things about immigrants and the U.S.-Mexico border that no other U.S. president has. But now he's reached directly into his predecessors' playbook by sending in the National Guard.