Officials in North Carolina said they have not received any requests to activate the state's troops to comply with the Trump White House's request.
"Tonight, National Guard troops are deploying to support border security missions along the U.S. southwest border", they said. But many of those troops were set back in duties far from the actual border. The Democratic governor of the fourth border state, California, has been silent on the issue.
Trump's call to bring in the military mirrored other recent policy and personnel announcements that have forced advisors to scramble.
The National Guard is expected to help border agents in tasks of 'aerial detection, transportation, fix of the border wall and logistical support, ' the Customs and Border Protection Office (CBP) said.
"We'll figure it out", he said.
Alabama Gov. Kay Ivey, a Republican, said Friday that she will consult with the head of the Alabama Guard to see what resources are available.
She said she did not know yet how many guard members would be deployed. Crossings are generally high in the spring, but the figure for last month was three times that of March 2017.
Trump carried Alabama easily in the 2016 presidential election and remains very popular in the heavily Republican state.
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A defense department memo said the authorization was valid through the current budget year, which ends on 30 September.
Meantime, Mexican senators and presidential candidates put aside differences to condemn Trump's decision.
"Mexico has very strong immigration laws".
"Some of the migrants planned to seek asylum in the U.S.as they were fleeing extreme violence in their home countries - and they would have been stopped or apprehended at the border accordingly, immigration experts said". Instead, he spoke at length about the "caravan" of migrants traveling through Mexico towards the USA border. Many in the region have dark associations with USA military presence and have been angered by rhetoric on illegal immigration.
Brown's office confirmed to CNN that the governor participated in Thursday's call with the Department of Homeland Security but said it had nothing to add beyond a statement from Lt. Col. Tom Keegan, a spokesman for the California Army National Guard, released Wednesday.
Their presence was especially felt in Palomas, Mexico, a smuggling hub south of the village of Columbus, New Mexico, where the increased presence and equipment was credited with easing illegal northbound immigrant travel.
Soldiers from the 36th Combat Aviation Brigade, 36th Infantry Division, preparing to deploy to the Texas-Mexico border on Friday in Austin, Texas. In the past, they've served in support roles like training, construction and intelligence gathering. What they have done, and can do, is mostly surveillance work to guide ICE and the Border Patrol to where they need to be. While some were armed for their own self-defense, they were not authorized to make arrests.
The combined Bush and Obama border deployments cost $1.4 billion.