The Arizona National Guard said they are working to coordinate the deployment, The guard members will support Customs and Border Protection and law enforcement in the field, according to a news release.
The first National Guardsmen will arrive on the border with Mexico this weekend to support the new new border security mission announced by President Donald Trump earlier this week.
More troops will be sent once mission requirements and locations are determined, she added.
Trump said at least 2,000 personnel would be deployed and some, if not all, will remain there until his planned - and highly controversial - border wall has been built. And the Texas Military Department, the umbrella agency over the Texas National Guard branches, said on its Twitter account that it would hold a Friday night news conference on its preparations, though further details were not immediately available.
The states of Texas and Arizona on Friday said they were sending 400 National Guard troops southwest as part of a White House plan to secure what it insists is a unsafe, porous border with Mexico.
Press Secretary Sarah Huckabee Sander tells reporters that regardless of what California decides "we'll continue moving forward with the other border states".
Mattis and homeland security secretary Kirstjen Nielsen said the decision came after their departments "identified security vulnerabilities that could be addressed by the National Guard".
Arizona is also planning to deploy 150 troops there next week.
The Arizona National Guard said in a statement Friday that it would "provide air, reconnaissance, operational and logistics support and construct border infrastructure". Find us on Facebook too! And, so far, officials there have been tight-lipped about whether they'll deploy National Guard troops.
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"It is imperative that this administration sit down with leaders in Congress on both sides of the aisle who want real solutions to our immigration challenges, rather than using political ploys to fire up President Trump's base and distract from growing controversy", Carper said. Opponents may not be able to prevent the president from calling on their state National Guard troops if Trump employs a federal law.
Gov. Jerry Brown hasn't made any public comment, though his office confirmed he participated in a call Thursday with other border state governors and Nielsen.
President Donald Trump said Thursday he wants to send up to 4,000 Guard members to the border to help federal officials fight illegal immigration and drug trafficking.
Democratic Gov. Kate Brown of OR said she would not send troops if asked because she is "deeply troubled by Trump's plan to militarize our border".
About 100 Guardsmen remain deployed as part of that existing state mission.
During the last two border deployments, the guard's supporting role was criticized by some people who thought they should be more involved in enforcement.
Both deployments were limited to around a year. "The problem for the National Guard guys now is that they will die of boredom because the Sinaloa Cartel will know where they are and won't send their drug packers through".