Updated at 7:45 a.m. ET Friday
Defense Secretary Jim Mattis is expected to sign an order sending at least 800 U.S. troops to the U.S.-Mexico border as a caravan of thousands of migrants heads north from Central America.
In another possible response to the approaching caravan, two White House officials declined to deny reports in The Washington Post, Politico and other media outlets that the administration is considering an executive order to close the southern border to migrants, including asylum seekers.
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