Active-duty military personnel began arriving along the southern border Thursday evening after President Donald Trump declared a national emergency to address the immigration crisis.

Active duty troops in Texas will be building permanent and temporary physical barriers to stop illegal border crossings, using intelligence analysts for the monitor and detection of migrants and military aircrafts to take detainees back to their country of origin.

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