Arizona and Texas are moving to send hundreds of National Guard troops to the U.S.-Mexico border within days as part of President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's push to shore up the area until his proposed wall is built.

Arizona Gov. Doug Ducey (R) announced Friday afternoon on Twitter that he would be sending around 150 Guard troops to the U.S.-Mexico border.

Our office is working closely with @AZNationalGuard, @DeptofDefense and @DHSgov on plans to deploy approximately 150 national guard members to the border next week — Doug Ducey (@dougducey) April 6, 2018

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Meanwhile, the Texas Military Department, which oversees the state’s National Guard, announced it would have 250 personnel and supporting aircraft, vehicles and equipment on the border with Mexico within 72 hours.

Trump on Wednesday signed a presidential memorandum directing Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE to support the Department of Homeland Security in securing the southern border to address a “surge of illegal activity,” including drug trafficking and illegal immigration.

The document does not specify how long or in what capacity the troops will serve.

The “lawlessness” at the southern border is “fundamentally incompatible with the safety, security, and sovereignty of the American people” and the administration “has no choice but to act,” the document states.

The president told reporters on Thursday that he wants to send between 2,000 and 4,000 National Guardsmen to the border.

That is lower than the 6,000 Guard troops former President George W. Bush sent in 2006 and the 1,200 former President Obama sent in 2010.

Former Texas Gov. Rick Perry Rick PerryOVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project Senate votes to confirm Energy's No. 2 official MORE (R) also sent the Guard to the border to help secure it in 2014.

Details are still scarce on the cost of the endeavor and the role the troops will have.

The Pentagon’s chief spokeswoman Dana White told reporters Thursday that the Guard’s efforts at the border will “act in support of border patrol agents who are performing law enforcement duties,” and will include aviation, engineering, surveillance, communications and vehicle maintenance.

Updated: 8:18 p.m.