(CNN) Texas is preparing to deploy National Guard troops and vehicles to the border with Mexico, the state's top military commander said Friday.

About 250 troops will be sent by Monday to the state's 1,254-mile long border with Mexico, Army National Guard Brig. Gen. Tracy Norris said.

"This mobilization supports the priorities of the governor and the President in securing our borders," she told reporters.

More troops will be sent once mission requirements and locations are determined, she added.

Notifications for troops will go in the mail Saturday telling troops they need to report as early as next week, Norris said.