In a sharp escalation of border security efforts, U.S. and Mexican forces will soon begin synchronized patrols along their respective sides of the southern border, the Pentagon announced Wednesday.

The plan would put a strip along the southern border under Pentagon control, allowing the military to detain migrants for trespassing on a military base until Border Patrol agents could arrest them.

Defense Secretary Pete Hegseth and Thomas D. Homan, President Trump’s border czar, toured areas near Mexico. By Reyes Mata III and Eric Schmitt Reyes Mata III reported from the southwestern U.S.