The order will deploy 1,500 troops to build physical barriers, but they will not be used for law enforcement, a military official says.

More is coming, but many directives will take time to be implemented or will face political, legal or practical obstacles.

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.

The new administration has also halted all refugee travel and processing, leaving thousands stranded as they wait to come to the US.

President Donald Trump on Monday kicked off his sweeping immigration crackdown, tasking the U.S. military with aiding border security, issuing a broad ban on asylum and taking steps to restrict citizenship for children born on U.