President Donald Trump's order to deploy National Guard forces to the U.S. border with Mexico has left key national security players in his administration scrambling to nail down details for the mission.
The president said this week that he wants to send as many as 4,000 National Guard troops there until his proposed wall is built, but the scope, cost and duration of the plan are still largely up in the air.
Top officials, however, have said they have been in constant communication with each other regarding the plan and the overall border security strategy in general.
"Secretary [James] Mattis agrees with Secretary [Kirstjen] Nielsen that border security is national security," chief Pentagon spokeswoman Dana White said Thursday during a press briefing.
"The communication between the White House and the Defense Department is very clear," White said.