Many remain determined to reach the U.S. through more dangerous means, riding freight trains, hiring smugglers and dodging authorities.

Premier combat troops have been ordered to the southern border, as part of Trump’s militarization of immigration.

Naser Zazai, 29, had planned to reunite with his mother and brother in the United States this week after fleeing Afghanistan, where he says he was threatened and attacked because his brother had once worked for the U.