Thousands of additional active duty US troops are being ordered to the southern US border with Mexico, just two days after President Donald Trump mandated that the US military step up its presence there,

The U.S. military will send 1,500 additional active-duty troops to the border with Mexico, the White House said on Wednesday, just two days after President Donald Trump signed an executive order on immigration.

The Pentagon said Wednesday it has begun deploying 1,500 active-duty troops to the southern border, putting in motion plans President Trump laid out in executive orders shortly after he took office to crack down on immigration.

The US-Mexico border is effectively closed off to migrants seeking asylum in the United States within hours of President Donald Trump taking office, an extraordinary departure from previous protocols that has left many concerned migrants in limbo.

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.