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AUSTIN, TX - APRIL 06: Texas National Guard helicopters traveling to the Texas-Mexico border prepare to fly on April 6, 2018 in Austin, Texas. Brigadier General Tracy Norris announced during a press conference that the Texas National Guard will immediately deploy an expected 250 peronnel with supporting aircraft, vehicles and equipment within 72 hours. (Photo by Drew Anthony Smith/Getty Images)
AUSTIN, TX - APRIL 06: Texas National Guard helicopters traveling to the Texas-Mexico border prepare to fly on April 6, 2018 in Austin, Texas. Brigadier General Tracy Norris announced during a press conference that the Texas National Guard will immediately deploy an expected 250 peronnel with supporting aircraft, vehicles and equipment within 72 hours. (Photo by Drew Anthony Smith/Getty Images)

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    Trump: We are sealing up our southern border

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Trump: We are sealing up our southern border

Defense Secretary James Mattis has signed orders to deploy up to 4,000 National Guard troops to the southern border of the US. CNN's Kaylee Hartung reports.

Trump: We are sealing up our southern border

Defense Secretary James Mattis has signed orders to deploy up to 4,000 National Guard troops to the southern border of the US. CNN's Kaylee Hartung reports.