The Pentagon has said that the U.S. military would provide flights to deport more than 5,000 immigrants held by U.S. authorities in El Paso, Texas, and San Diego, California.

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.

President Donald Trump’s plans to seal the U.S.-Mexico border and conduct mass deportations might soon run into a major roadblock: Mexico and the countries where the immigrants come from might not accept some of them back.