About 500 Marines and sailors based at Camp Pendleton in northern San Diego County are being deployed to areas along the border with Mexico as part of President Donald Trump’s crackdown on immigration.

About 500 Camp Pendleton-based Marines and sailors are being deployed to the U.S.-Mexico border as part of President Trump’s mandate to secure the southern border.

Marines from Camp Pendleton are among 1,500 troops deployed all along the border under an executive order from President Donald Trump declaring a national emergency at the southern border.

Troops from Fort Campbell, Kentucky, are being sent to the U.S. border under President Trump to assist in deportations and security.

President Trump has deployed 1,500 active-duty troops to the U.S. border with Mexico. But a nearly 150-year-old law, the Posse Comitatus Act, bars using the military for domestic law enforcement purposes.