Mexico has refused a request from President Donald Trump's administration to allow a U.S. military aircraft deporting migrants to land in the country, a U.S. official and a Mexican official told Reuters.

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.