Mexico was raising sprawling tents on the U.S. border Wednesday as it braced for President Donald Trump to fulfill his pledge to reverse mass migration.

Trump’s Border Czar announced that “targeted enforcement operations” and deportations have begun. Mexico has started preparations to receive deportees.

Thousands of migrants are now in limbo at the U.S.-Mexico border after President Trump shut down the main legal channel for asylum seekers to enter the country. Many had waited months for immigration appointments,

U.S. border agents have been instructed to summarily deport migrants crossing into the country illegally without allowing them to request legal protection.

The Trump administration has essentially eliminated the ability to pursue asylum at the border, attempting to erase by executive order a right established in U.S. and international law. The restrictions leave migrants who claim they fear for their lives almost no path toward safety in the United States.