Donald Trump has authorized the military to take control of land at the US-Mexico border as part of the president’s broader efforts to crack down on undocumented immigration.

The authorization came late on Friday in a memorandum from Trump to interior secretary Doug Burgum, defense secretary Pete Hegseth, homeland security secretary Kristi Noem and agricultural secretary Brooke Rollins, outlining new policies concerning military involvement at the US’s southern border.

The memorandum, entitled “Military Mission for Sealing the Southern Border of the United States and Repelling Invasions”, allows the US’s armed forces to “take a more direct role” when it comes to securing the boundary in question.