Former Arizona Governor Jan Brewer (R) said Saturday "it's outrageous" that some states are refusing to comply with 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 order to send National Guard troops to secure the southern border with Mexico.

"It's unfortunate they're just sitting on their hands and doing nothing. They're not taking the issue seriously," Brewer told host Neil Cavuto on Fox News. "It's outrageous that they're doing what they're doing."

States including Montana and Nevada, each led by GOP governors, refused to send troops to aid the president's efforts, calling the move a "whim" and inappropriate use, respectively, even as Trump is working to halt the steadily increasing rate of illegal crossings.

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Arizona quickly agreed to Trump's directive, as Gov. Doug Ducey (R) announced Friday that the state would deploy 150 troops to the U.S.-Mexico border. Texas will also deploy another 250 troops along with military equipment and aircraft to clamp down on security.

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 signed Trump's memorandum on Friday that allowed the National Guard to deploy up to 4,000 National Guard members to the southern border, which came after Trump said he would station troops there until a full border wall is completed.

Brewer said she was "excited and encouraged" by Trump following through on his key campaign promise for tougher border security.